Students Q and A

Z-Score

Z-Score

by Fouzia Akter -
Number of replies: 56

How Z-Score is different from Standard Deviation?

In reply to Fouzia Akter

Re: Z-Score

by alma akondo -

A z-score is a numerical measurement that describes a value's relationship to the mean   of a group of valuesz-score is measured in terms of standard deviations from the mean. If a  z-score is 0, it indicates that the data point's score is identical to the mean score. 

The standard deviation the spread of the data about the mean value. ... For example, the mean of the following two is the same: 15, 15, 15, 14, 16 and 2, 7, 14, 22, 30. However, the second is clearly more spread out. If a set has a low standard deviation, the values are not spread out too much.

So, z- sore is different from Standard Deviation

In reply to Fouzia Akter

Re: Z-Score

by Mahima Afroz -

Standard deviation defines the line along which a particular data point lies. It is essentially a reflection of the amount of variability within a given data set.

Z-Score indicates how much a given value differs from the standard deviation.

So, Z-Score is different from standard deviation.

In reply to Fouzia Akter

Re: Z-Score

by MD.Fuad Hasan Pulok -
Picture of NFE 123 201 PC C

Z-score indicates how much a given value differs from the standard deviation. The Z-score, or standard score, is the number of standard deviations a given data point lies above or below mean. Standard deviation is essentially a reflection of the amount of variability within a given data set.

Because every sample value has a correponding z-score it is possible then to graph the distribution of z-scores for every sample. ... The standard deviation of the z-scores is always 1. The graph of the z-score distribution always has the same shape as the original distribution of sample values.

In reply to MD.Fuad Hasan Pulok

Re: Z-Score

by Shayma Aziz -
Picture of NFE 123 201 PC C

Z-score always indicates how much a given value differs from Standard deviation. Z-score & Standard deviation are two such fundamentals. Difference are, Z-score is the number of standard deviations a given data point lies above or below the mean. The mean is the average of all values in group, added together, and then divided by the total number of items in the group. Standard deviation is essentially a reflection of the amount of variability within a given data set.it shows the extent to which the individual data points in a data set vary from the mean. Z-score can help traders gauge the volatility of securities. Standard deviation helps to indicate how a particular investment will perform, so, it is a particular investment. Z-score, a result of one indicates the point is one standard deviation above the mean and when data points are below the mean, the Z-score is negative. In standard deviation, first calculate the difference between each data point and the mean. The differences are then squared, summed, and averaged to produce the variance.


In reply to Fouzia Akter

Re: Z-Score

by Ankhi Biswas -
Picture of NFE 123 201 MC A

Ankhi Biswas

Section-A(MC) 

Standrad Deviation basically reflects the amount of variability in a given data set and is calculated by finding the difference between each data point and the mean. These differences are then squared, summed and averaged to produce the variance. The square root of this variance is the standard deviation.

On the other hand, Z-Score is the number of standard deviations a given data point lies away from the mean. This measure is calculated by subtracting the mean from each point and dividing the result by the standard deviation. The Z Score is negative for data points that are below the mean. It has been found that in most large data sets, 99% of the values have a Z Score between -3 and 3, which means they lie within three standard deviations above and below the mean.

Both Standard Deviation and Z Score are highly useful tools for determining market volatility. As the standard deviation increases, it indicates that price action varies widely within the established time frame. Once we know this, we can use the Z-Score of a particular price to find out how typical or atypical this movement is, based on previous performance.

One of the most widely used technical indicators based on standard deviation is Bollinger Bands, which are a visual representation of the Z-Score. For any given price, the number of standard deviations from the mean is reflected by the number of Bollinger Bands between the price and the exponential moving average or EMA.

In reply to Fouzia Akter

Re: Z-Score

by Faria Wadud -
Picture of NFE 123 201 MC A

Z-score and standard deviation are 2 parameters of measuring different types of nutritional assessment.Standard deviation can be calculated from the given data set and mean value.But when we need to calculate the Z-score we need to know about observed value,mean value and also standard deviation.Standard deviation is a part of Z-score.We can't calculate the Z-score without knowing the standard deviation                        

In reply to Fouzia Akter

Re: Z-Score

by Sadia Ali Rafa -
Picture of NFE 123 201 MC B

How Z-Score is different from Standard Deviation?

Answer: The standard deviation is a measure of the spread of scores within a set of data. Standard deviation defines the line along which a particular data point lies. It is essentially a reflection of the amount of variability within a given data set.

Z-score gives us an idea of  how far from the mean a data point is. But more technically it’s a measure of how many standard deviations below or above the population mean a raw score is.

So, we can say that Z-score is belongs in standard deviation. But these teo are not same.

Thank you..

201-34-1064


In reply to Fouzia Akter

Re: Z-Score

by Khaled Mussaruf -
Picture of NFE 123 201 MC A

8

Down vote

Accepted

Typically you have a collection of values of some variable. If the variable is human height, these values might be expressed in inches or centimetres; if it’s human weight, in pounds or kilograms. The standard deviation is a specific number of these units; roughly speaking, it’s the size of a typical deviation from the mean of these measurements. To compare two different collections of measurements, it’s generally very desirable to express them in units that make these typical deviations the same size. We might call such units standard units: standard units are units chosen so that the mean (average) of the measurements is 00, and a typical deviation −− technically, the standard deviation −− has size 11. The zz-scores are just the original measurements expressed in these standard units instead of the original units of measurement.


The conversion is actually quite similar to the conversion between two more familiar units of measurement. If you measure a length in inches (or centimetres) and then convert that measurement to feet (or metres), you have to multiply by 112112 (or 11001100), because each inch is 112112 of a foot (each centimetre is 11001100 of a metre). Suppose that you’re measuring human heights, and you get a standard deviation of 33 inches. Then for this sample 11 standard unit is 33 inches, and each inch is 1/31/3 of a standard unit. Someone whose height is 4.54.5 inches above the mean is 4.5⋅13=1.54.5⋅13=1.5 standard units above the average. This deviation of 1.51.5 standard units is the zz-score corresponding to that height of 4.54.5 inches above average.


You might say that the standard deviation is a yardstick, and a zz-score is a measurement expressed in terms of that yardstick.


The situation is a little different from simple conversion between inches and feet, though. It’s more like conversion between Fahrenheit and Celsius temperatures: not only does the size of the unit change, but also the 00 point. Just as 0∘0∘ C is 32∘32∘ F, not 0∘0∘ F, the 00 point for zz-scores is generally not the same as the 00 point for the actual measurements. A sample of adult American males, for instance, might have an average height of 7070 inches, so that someone 4.54.5 inches above the average would be 74.574.5 inches tall. The 00 point for zz-scores, measured in standard units, is always right at the average, so in this case a height of 7070 inches would correspond to a zz-score of 00. A height of 74.574.5 inches, being 4.54.5 inches and therefore (as we saw before) 1.51.5 standard units above average, would correspond to a zz-score of 0+1.5=1.50+1.5=1.5. And so on.


When you calculate

z=x−x¯s

z=x−x¯s

to get a zz-score zz from a measurement xx, you’re doing the same kind of unit conversion that you do in converting a temperature from one scale to the other. The calculation x−x¯x−x¯ gives you the deviation of your actual measurement from the mean; in my example, that’s 74.5−70=4.574.5−70=4.5 inches. When you divide by ss, the standard deviation, you’re changing ‘yardsticks’ from inches to standard units. In the example s=3s=3 inches, so you’re multiplying the deviation of 4.54.5 inches by the conversion (scaling) factor of 1313 of a standard unit per inch.


One point of these standard units is that the permit comparison of distributions. For example, women are on average shorter than men, and their heights vary a bit less. Thus, a woman who is 33 inches above the female average is, relative to the female population, taller than a man who is 33 inches above the male average. But how much taller? Use of standard units makes it possible to answer that kind of question. I’m using data that are now a bit out of date, but very roughly she is 1.21.2 standard units above the female average, while he is only 11 standard unit above the male average.

In reply to Fouzia Akter

Re: Z-Score

by Tahamet Jahan Mishu -
Picture of NFE 123 201 MC B

Z-score indicates how much a given value differs from the standard deviation. The Z-score, or standard score, is the number of standard deviations a given data point lies above or below mean. Standard deviation is essentially a reflection of the amount of variability within a given data set.

In reply to Fouzia Akter

Re: Z-Score

by Sadia Yousuf Riya -
Picture of NFE 123 201 MC B

Z-score indicates how much a given value differs from the standard deviation. The Z-scoreor standard score, is the number of standard deviations a given data point lies above or below mean. Standard deviation is essentially a reflection of the amount of variability within a given data set

In reply to Fouzia Akter

How Z-Score is different from Standard Deviation?

by Fateha Jahan -
Picture of NFE 123 201 MC A

A z-score is a numerical measurement that describes a value's relationship to the mean   of a group of values. z-score is measured in terms of standard deviations from the mean. If a  z-score is 0, it indicates that the data point's score is identical to the mean score. 


The standard deviation the spread of the data about the mean value. ... For example, the mean of the following two is the same: 15, 15, 15, 14, 16 and 2, 7, 14, 22, 30. However, the second is clearly more spread out. If a set has a low standard deviation, the values are not spread out too much.


So, z- sore is different from Standard Deviation

In reply to Fouzia Akter

Re: Z-Score

by Shameem Hossain -

Z-score indicates how much a given value differs from the standard deviation. The Z-score, or standard score, is the number of standard deviations a given data point lies above or below mean. Standard deviation is essentially a reflection of the amount of variability within a given data set.

example: 

z = (x – μ) / σ
The test has a mean (μ) of 150 and a standard deviation (σ) of 25. Assuming a normal distribution, your z score would be: z = (x – μ) / σ = (190 – 150) / 25 = 1.6.
In reply to Fouzia Akter

Re: Z-Score

by Farhin Ahmed -
Picture of NFE 123 201 MC B

Z-score indicates how much a given value differs from the standard deviation. The Z-score, or standard score, is the number of standard deviations a given data point lies above or below mean. Standard deviation is essentially a reflection of the amount of variability within a given data set.

In reply to Fouzia Akter

Re: Z-Score

by Mst Mortuza Aktar -
Picture of NFE 123 201 MC B

Z-score indicates how much a given value differs from the standard deviation . The Z-score, or standard score,is the number of standard  deviations a given data point lies above or below mean.Standard deviation  is essentially a reflection of the amount of variability within a given data set.Because every sample value has a correponding z-score  it is possible then to graph the distribution of z-scores for every sample. ... The standard deviation  of the z-scores is always 1(one). The graph of the z-scores distribution always has the same shape as the original distribution of sample values.The value of the z-score tells you how many standard deviations you are away from the mean. If a z-score is equal to 0, it is on the mean. A positive z-score indicates the raw score is higher than the mean average. For example, if a z-score is equal to +1, it is 1 standard deviation above the mean.

In reply to Fouzia Akter

Re: Z-Score

by Sadia Islam -
Picture of NFE 123 201 MC A

Standard Deviation basically reflects the amount of variability in a given data set and is calculated by finding the difference between each data point and the mean. These differences are then squared, summed and averaged to produce the variance. The square root of this variance is the standard deviation.

On the other hand, Z Score is the number of standard deviations a given data point lies away from the mean. This measure is calculated by subtracting the mean from each point and dividing the result by the standard deviation. The Z score is negative for data points that are below the mean. It has been found that in most large data sets, 99% of the values have a Z score between -3 and 3, which means they lie within three standard deviations above and below the mean.

Both Standard Deviation and Z score are highly useful tools for determining market volatility. As the standard deviation increases, it indicates that price action varies widely within the established time frame. Once we know this, we can use the Z score of a particular price to find out how typical or atypical this movement is, based on previous performance.


In reply to Fouzia Akter

Re: Z-Score

by Tasnim Taofiq Simin -
Picture of NFE 123 201 MC B

Tasnim Taofiq Simin 

ID : 192-34-973

Answer :  Basically, A z-score or standard deviation is a measure of the dispersion of data. Z-score indicates how much a given value differs from the standard deviation. Z-score is the number of standard deviations a given data point lies away from the mean. This measure is calculated by subtracting the mean from each point and dividing the results by the standard deviation. 

On the other hand,  Standard Deviation basically reflects the amount of variability in a given data set and is calculate by finding the difference between each data point and the mean. Standard deviation is essentially a reflection of the amount of variability within a given data set.  

So,  That's why Z-score is different from standad deviation.


In reply to Fouzia Akter

Re: Z-Score

by Safura Afrin Diba -
Picture of NFE 123 201 MC B

standard deviation defines the line along which a particular data point lies. it is essentially a reflection of the ammount of variability within a given data set . but in Z-Score indicates how much a given value differs from the standard deviation.

In reply to Fouzia Akter

Re: Z-Score

by Saifunnahar Bethi -
Picture of NFE 123 201 MC B

z-score is a numerical measurement that describes a value's relationship to the mean   of a group of values. z-score is measured in terms of standard deviations from the mean. If a  z-score is 0, it indicates that the data point's score is identical to the mean score. 

The standard deviation the spread of the data about the mean value. ... For example, the mean of the following two is the same: 15, 15, 15, 14, 16 and 2, 7, 14, 22, 30. However, the second is clearly more spread out. If a set has a low standard deviation, the values are not spread out too much.

So, z- sore is different from Standard Deviatio


In reply to Saifunnahar Bethi

Re: Z-Score

by Saifunnahar Bethi -
Picture of NFE 123 201 MC B

z-score is a numerical measurement that describes a value's relationship to the mean   of a group of values. z-score is measured in terms of standard deviations from the mean. If a  z-score is 0, it indicates that the data point's score is identical to the mean score. 

The standard deviation the spread of the data about the mean value. ... For example, the mean of the following two is the same: 15, 15, 15, 14, 16 and 2, 7, 14, 22, 30. However, the second is clearly more spread out. If a set has a low standard deviation, the values are not spread out too much.

So, z- sore is different from Standard Deviatio


In reply to Fouzia Akter

Re: Z-Score

by Israt Jahan (201-34-1094) -
Picture of NFE 123 201 MC A

Standrad Deviation normally  reflects the amount of variability in a given data set and is calculated by finding the difference between each data point and the mean. These differences are then squared, summed and averaged to produce the variance. The square root of this variance is the standard deviation.

And Z- Score indicates how much a given value differs from the standard deviation. 

So, Z-Score is different from Standard Deviation

In reply to Fouzia Akter

Re: Z-Score

by Mahmuda Huq -
Picture of NFE 123 201 PC A

Standard deviation and the Z-score are two such fundamentals. Z-scores can help traders gauge the volatility of securities.

Standard deviation is a statistical measure that shows how elements are dispersed around the average, or mean. Standard deviation helps to indicate how a particular investment will perform, so, it is a predictive calculation.

  • Standard deviation defines the line along which a particular data point lies.
  • Z-score indicates how much a given value differs from the standard deviation.
  • The Z-score, or standard score, is the number of standard deviations a given data point lies above or below mean.
  • Standard deviation is essentially a reflection of the amount of variability within a given data set.
In reply to Fouzia Akter

Re: Z-Score

by Abida Zaman -
Picture of NFE 123 201 PC A

ID: 201-34-303

Answer:The standard deviation specifies the line where there is a specific data point.


 The value indicated by the Z-score indicates how different it is from the deviation


The Z-score, or standard score, is the average of the given data points or the number of standard deviations above and below. 


 Standard deviation is basically a reflection of the amount of variability in a given data set.


Bollinger Bands is a technical indicator that traders and analysts use to assess market volatility based on standard deviations.

In reply to Fouzia Akter

Re: Z-Score

by Aisha Siddika -
Standard Deviation basically reflects the amount of variability in a given data set and is calculated by finding the difference between each data point and the mean. These differences are then squared, summed and averaged to produce the variance. The square root of this variance is the standard deviation.

 On the other hand, Z-Score is the number of standard deviations a given data point lies away from the mean. This measure is calculated by subtracting the mean from each point and dividing the result by the standard deviation. The Z Score is negative for data points that are below the mean. It has been found that in most large data sets, 99% of the values have a Z Score between -3 and 3, which means they lie within three standard deviations above and below the mean.

For this,  Z-score is different from Standard Deviation.    
In reply to Fouzia Akter

Re: Z-Score

by Nazia 201-34-1089 -
Picture of NFE 123 201 MC A

Z-score indicates how much a given value differs from the standard deviation. The Z-score, or standard score, is the number of standard deviations a given data point lies above or below mean. Standard deviation is essentially a reflection of the amount of variability within a given data set.Standard deviation and the Z-score are two such fundamentals. Z-scores can help traders gauge the volatility of securities. The score shows how far away from the mean—either above or below—a value is situated. Standard deviation is a statistical measure that shows how elements are dispersed around the average, or mean. Standard deviation helps to indicate how a particular investment will perform, so, it is a predictive calculation. In finance, the Z-score helps to predict the probability of an entity filing for bankruptcy and is known as the Altman Z-score.

In reply to Fouzia Akter

Re: Z-Score

by Iffath ara -

  1. Standard deviation means a quantity expressing by how much the members of a group differ from the mean value for the group. Whereas z-score means how much a given value differs from the standard deviation. So these two things aren't same and this way they are different from each other. 


In reply to Fouzia Akter

Re: Z-Score

by Farzana Akter Kathi -
Picture of NFE 123 201 MC B

Ans: Z-score indicates how much a given value differs from the standard deviation. The Z-score, or standard score, is the number of standard deviations a given data point lies above or below mean. Standard deviation is essentially a reflection of the amount of variability within a given data set.Standard deviation and the Z-score are two such fundamentals. Z-scores can help traders gauge the volatility of securities. The score shows how far away from the mean—either above or below—a value is situated. Standard deviation is a statistical measure that shows how elements are dispersed around the average, or mean. Standard deviation helps to indicate how a particular investment will perform, so, it is a predictive calculation. In finance, the Z-score helps to predict the probability of an entity filing for bankruptcy and is known as the Altman Z-Score.


In reply to Fouzia Akter

Re: Z-Score

by Sumaiya binte Mohibur -
Picture of NFE 123 201 MC A

standard deviation defines the line along which a particular data point lies. it is essentially a reflection of the ammount of variability within a given data set . but in Z-Score indicates how much a given value differs from the standard deviation.

In reply to Fouzia Akter

Re: Z-Score

by Nahin Afrose -
Picture of NFE 123 201 PC A

ID:201-34-248

Ans: Z-score indicates how much a given value differs from the standard deviation. The Z-scoreor standard score, is the number of standard deviations a given data point lies above or below mean. Standard deviation is essentially a reflection of the amount of variability within a given data set.Standard deviation and the Z-score are two such fundamentals. Z-scores can help traders gauge the volatility of securities. The score shows how far away from the mean—either above or below—a value is situated. Standard deviation is a statistical measure that shows how elements are dispersed around the average, or mean. Standard deviation helps to indicate how a particular investment will perform, so, it is a predictive calculation. In finance, the Z-score helps to predict the probability of an entity filing for bankruptcy and is known as the Altman Z-Score

In reply to Fouzia Akter

Re: Z-Score

by Refa Tamanna -


Z-score indicates how much a given value differs from the standard deviation. The Z-score, or standard score, is the number of standard deviations a given data point lies above or below mean. Standard deviation is essentially a reflection of the amount of variability within a given data set.Standard deviation and the Z-score are two such fundamentals. Z-scores can help traders gauge the volatility of securities. The score shows how far away from the mean—either above or below—a value is situated. Standard deviation is a statistical measure that shows how elements are dispersed around the average, or mean. Standard deviation helps to indicate how a particular investment will perform, so, it is a predictive calculation. In finance, the Z-score helps to predict the probability of an entity filing for bankruptcy and is known as the Altman Z-score.

In reply to Fouzia Akter

Re: Z-Score

by Jannatul firdous Taisir -

Standrad Deviation normally  reflects the amount of variability in a given data set and is calculated by finding the difference between each data point and the mean. These differences are then squared, summed and averaged to produce the variance. The square root of this variance is the standard deviation.

And Z- Score indicates how much a given value differs from the standard deviation. 

So, Z-Score is different from Standard Deviation

In reply to Fouzia Akter

Re: Z-Score

by Munia Rahman Mim -
Picture of NFE 123 201 MC B

Munia Rahman Mim

ID;201-34-1070


Z
-score indicates how much a given value differs from the standard deviation. The Z-score, or standard score, is the number of standard deviations a given data point lies above or below mean. Standard deviation is essentially a reflection of the amount of variability within a given data set.

The standard deviation the spread of the data about the mean value. ... For example, the mean of the following two is the same: 15, 15, 15, 14, 16 and 2, 7, 14, 22, 30. However, the second is clearly more spread out. If a set has a low standard deviation, the values are not spread out too much.

So, z- sore is different from Standard Deviatio


   

In reply to Fouzia Akter

Re: Z-Score

by Israt Jahan Imu -
Picture of NFE 123 201 MC B

Z-score indicates how much a given value differs from the standard deviation. The Z-score, or standard score, is the number of standard deviations a given data point lies above or below mean. Standard deviation is essentially a reflection of the amount of variability within a given data set.

Id no:201-34-1072

In reply to Fouzia Akter

Re: Z-Score

by Habiba Ahmed -
Picture of NFE 123 201 PC C

z-score is a numerical measurement that describes a value's relationship to the mean   of a group of values. z-score is measured in terms of standard deviations from the mean. If a  z-score is 0, it indicates that the data point's score is identical to the mean score. 



Standard deviation is the measure of dispersion of a set of data from its mean. It measures the absolute variability of a distribution; the higher the dispersion or variability, the greater is the standard deviation and greater will be the magnitude of the deviation of the value from their mean.

In reply to Fouzia Akter

Re: Z-Score

by Sabikun Naher Meem -
Picture of NFE 123 201 MC B
Z-score is different from Standard Deviation because standard deviation is a step or part to find out the z-score.  and z score describes the position of a raw score in terms of its distance from the mean. On the other hand, standard deviation a quantity expressing by how much the members of a group differ from the mean value for the group. we have to know the standard deviation to find a particular z score of a given raw score. the finding formula of both standard deviation and z-score is different.
In reply to Fouzia Akter

Re: Z-Score

by Afia Antara -
Picture of NFE 123 201 MC B

Standard deviation measures the spread of the data about the mean value.Standard Deviation basically reflects the amount of variability in a given data set and is calculated by finding the difference between each data point and the mean. On the other hand, z-score describes the position of a raw score in terms of its distance from the mean, when measured in standard deviation units.Z-Score is the number of standard deviations a given data point lies away from the mean. This measure is calculated by subtracting the mean from each point and dividing the result by the standard deviation.

In reply to Fouzia Akter

Re: Z-Score

by Sadia Jannat -

Z-score is the difference of one value from standard deviation. On the contrary, standard deviation is the difference of one value from the mean. 

Z-score is different from standard deviation in the following ways-  

  • Standard deviation defines the line along which a particular data point lies.
  • Z-score indicates how much a given value differs from the standard deviation.
  • The Z-score, or standard score, is the number of standard deviations a given data point lies above or below mean.
  • Standard deviation is essentially a reflection of the amount of variability within a given data set.
In reply to Fouzia Akter

Re: Z-Score

by Tabassum Prapti -
Z-score is different from Standard Deviation because standard deviation is a step or part to find out the z-score.  and z score describes the position of a raw score in terms of its distance from the mean. On the other hand, standard deviation a quantity expressing by how much the members of a group differ from the mean value for the group. we have to know the standard deviation to find a particular z score of a given raw score. the finding formula of both standard deviation and z-score is different.
REPLY

In reply to Fouzia Akter

Re: Z-Score

by Prema Saha -
Picture of NFE 123 201 MC A

Standard deviation and the Z-score are two such fundamentals. Z-scores can help traders gauge the volatility of securities. The score shows how far away from the mean either above or below a value is situated. Standard deviation is a statistical measure that shows how elements are dispersed around the average, or mean. Standard deviation helps to indicate how a particular investment will perform, so, it is a predictive calculation. In finance, the Z-score helps to predict the probability of an entity filing for bankruptcy and is known as the Altman Z-score.Z-score indicates how much a given value differs from the standard deviation. The Z-score, or standard score, is the number of standard deviations a given data point lies above or below mean. Standard deviation is essentially a reflection of the amount of variability within a given data set.

In reply to Fouzia Akter

Re: Z-Score

by Saifunnahar Bethi -
Picture of NFE 123 201 MC B

 z-score is a numerical measurement that describes a value's relationship to the mean   of a group of values. z-score is measured in terms of standard deviations from the mean. If a  z-score is 0, it indicates that the data point's score is identical to the mean score. 

The standard deviation the spread of the data about the mean value. ... For example, the mean of the following two is the same: 15, 15, 15, 14, 16 and 2, 7, 14, 22, 30. However, the second is clearly more spread out. If a set has a low standard deviation, the values are not spread out too much.

So, z- sore is different from Standard Deviation


In reply to Fouzia Akter

Re: Z-Score

by Nishat Tandra -
Picture of NFE 123 201 MC A

Z-score is quite different from  standard Deviation.I think Z-score use is very important for us.Because Z -score indicates how much a given value  differs from the standard deviation. The z-score or standared score, is the number of standared deviations a given data point lies above or below mean.Other side standared deviation is essentially a reflection of the amount of variability  with in a given data set.

In reply to Fouzia Akter

Re: Z-Score

by Shanto Karmoker -
Picture of NFE 123 201 PC A

 
Standard Deviation basically reflects the amount of variability in a given data set and is calculated by finding the difference between each data point and the mean. These differences are then squared, summed and averaged to produce the variance. The square root of this variance is the standard deviation.

 On the other hand, Z-Score is the number of standard deviations a given data point lies away from the mean. This measure is calculated by subtracting the mean from each point and dividing the result by the standard deviation. The Z Score is negative for data points that are below the mean. It has been found that in most large data sets, 99% of the values have a Z Score between -3 and 3, which means they lie within three standard deviations above and below the mean.

For this,  Z-score is different from Standard Deviation.    

In reply to Fouzia Akter

Re: Z-Score

by alma akondo -

Standard Deviation is the standardised (divided by standard deviation) measure of average of distance of each data point from mean of dataset or distribution. However, Z score is a measure of Standard deviation for Standard Normal Distribution only. Standard Normal Distribution means mean = 0 and standard deviation = 1. Z score is a measure of standard deviation on Z scale.

In reply to Fouzia Akter

Re: Z-Score

by Afrin Ontu -
Picture of NFE 123 201 MC A

 Standard Deviation basically reflects the amount of variability in a given data set and is calculated by finding the difference between each data point and the mean. These differences are then squared, summed and averaged to produce the variance. The square root of this variance is the standard deviation.


Z-score is the difference of one value from standard deviation. On the contrary, standard deviation is the difference of one value from the mean. 

Z-score is different from standard deviation in the following ways-  

Standard deviation defines the line along which a particular data point lies.

  • Z-score indicates how much a given value differs from the standard deviation.
  • The Z-score, or standard score, is the number of standard deviations a given data point lies above or below mean.
In reply to Fouzia Akter

Re: Z-Score

by sumi 295 -
Picture of NFE 123 201 PC C

Z-score is measured in terms of standard deviations from the mean.If a z-score is 0 it indicates that the data points score is identical to the mean score.

The standard deviation the spread of the data about the mean value.z- score always indicates how much given value differs from standard deviation.

So z-score is different from standard deviation 

In reply to Fouzia Akter

Re: Z-Score

by Jeba fariha 201-34-1043 -
Picture of NFE 123 201 MC A

Jeba Fariha

201-34-1043

SectionA

  Standrad Deviation normally  reflects the amount of variability in a given data set and is calculated by finding the difference between each data point and the mean. These differences are then squared, summed and averaged to produce the variance. The square root of this variance is the standard deviation.

And Z- Score indicates how much a given value differs from the standard deviation. 

So, Z-Score is different from Standard Deviation

In reply to Fouzia Akter

Re: Z-Score

by Marjia Sultana Bithi -
Picture of NFE 123 201 MC B

Differences between Z- score and standard deviation :

Standard deviation defines the line along which a particular data point lies.

Z-score indicates how much a given value differs from the standard deviation.

The Z-score, or standard score, is the number of standard deviations a given data point lies above or below mean.

Standard deviation is essentially a reflection of the amount of variability within a given data set.

Bollinger Bands are a technical indicator used by traders and analysts to assess market volatility based on standard deviation.


A Z-score is a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean. If a Z-score is 0, it indicates that the data point's score is identical to the mean score. A Z-score of 1.0 would indicate a value that is one standard deviation from the mean. Z-scores may be positive or negative, with a positive value indicating the score is above the mean and a negative score indicating it is below the mean.


The Z- score, or standard score, is the number of standard deviations a given data point lies above or below the mean. The mean is the average of all values in a group, added together, and then divided by the total number of items in the group. 


Standard deviation is a number used to tell how measurements for a group are spread out from the average (mean), or expected value. A low standard deviation means that most of the numbers are close to the average. A high standard deviation means that the numbers are more spread out.


Standard deviation is essentially a reflection of the amount of variability within a given data set. It shows the extent to which the individual data points in a data set vary from the mean. 


In reply to Fouzia Akter

Re: Z-Score

by Kowshik Mishra -
Picture of NFE 123 201 MC B

Standard deviation is a part of z-score as it indicates how much the given value differs from the standard deviation. We can calculate standard deviation from the given value and mean value. And z score is calculated from the given data, mean value and standard deviation. To find the results of z score, we first have to know the value of standard deviation.

In reply to Fouzia Akter

Re: Z-Score

by Sadia Afrin -
Picture of NFE 123 201 MC A

Z-score is indicate how much a given value differs from the standard deviation. The z-score, or standard score is the number of standard deviations a given data point lies above or below mean. Standard deviation is essentially a reflection of the amount variability within a given data set. 

                

In reply to Fouzia Akter

Re: Z-Score

by Mahmuda Huq -
Picture of NFE 123 201 PC A

Z-score indicates how much a given value differs from the standard deviation. The Z-score, or standard score, is the number of standard deviations a given data point lies above or below mean. Standard deviation is essentially a reflection of the amount of variability within a given data set.

In reply to Fouzia Akter

Re: Z-Score

by Sanzida Zaman Mim -
Yes Z-Score is different from Standard Deviation .
Z-score indicates how much a given value differs from the standard deviation. The Z-score, or standard score, is the number of standard deviations a given data point lies above or below mean.
Standard deviation is essentially a reflection of the amount of variability within a given data set.
In reply to Fouzia Akter

Re: Z-Score

by Someya Reza -
Picture of NFE 123 201 PC C
Standard deviation is essentially a reflection of the amount of variability within a given data set.Z-score indicates how much a given value differs from the standard deviation. The Z-score, or standard score, is the number of standard deviations a given data point lies above or below mean.
In reply to Fouzia Akter

Re: Z-Score

by Umma kulsum Nilu -
Picture of NFE 123 201 MC B
Z-score indicates how much a given value differs from the standard deviation. The Z-score, or standard score, is the number of standard deviations a given data point lies above or below mean. Standard deviation is essentially a reflection of the amount of variability within a given data set
In reply to Fouzia Akter

Re: Z-Score

by Jaima Jannat Shikha -

Z-score indicates how much a given value differs from the standard deviation. The Z-score, or standard score, is the number of standard deviations a given data point lies above or below mean. Standard deviation is essentially a reflection of the amount of variability within a given data set.

In reply to Fouzia Akter

Re: Z-Score

by MOHAMMAD EYAHYA -
Picture of NFE 123 201 MC B
Z-score indicates how much a given value differs from the standard deviation. The Z-score, or standard score, is the number of standard deviations a given data point lies above or below mean. Standard deviation is essentially a reflection of the amount of variability within a given data set.