# If a set of data has 100 points and a variance 4 then what is the standard deviation?

Standard deviation is the square root of the variance. Since you stated the variance is 4, the standard deviation is 2.

### Can the variance be zero?

Variance is standard deviation squared. If standard deviation can be zero then the variance can obviously be zero because zero squared is still zero. The standard deviation is equal to the sum of the squares of each data point in your data set minus the mean, all that over n. The idea is that if all of your data points are the same then the mean will be the same as every data point. If…

### What are are measures of variability or dispersion within a set of data?

Some measures: Range, Interquartile range, Interpercentile ranges, Mean absolute deviation, Variance, Standard deviation. Some measures: Range, Interquartile range, Interpercentile ranges, Mean absolute deviation, Variance, Standard deviation. Some measures: Range, Interquartile range, Interpercentile ranges, Mean absolute deviation, Variance, Standard deviation. Some measures: Range, Interquartile range, Interpercentile ranges, Mean absolute deviation, Variance, Standard deviation.

### Why standard deviation is more often used than variance?

Both variance and standard deviation are measures of dispersion or variability in a set of data. They both measure how far the observations are scattered away from the mean (or average). While computing the variance, you compute the deviation of each observation from the mean, square it and sum all of the squared deviations. This somewhat exaggerates the true picure because the numbers become large when you square them. So, we take the square root…

### How do you calculate salary variance?

I believe you are interested in calculating the variance from a set of data related to salaries. Variance = square of the standard deviation, where: s= square root[sum (xi- mean)2/(n-1)] where mean of the set is the sum of all data divided by the number in the sample. X of i is a single data point (single salary). If instead of a sample of data, you have the entire population of size N, substitute N…

### Why would someone need a standard deviation calculator?

A standard deviation calculator allows the user to find the mean spread away from the mean in a statistical environment. Most users needing to find the standard deviation are in the statistics field. Usually, the data set will be given and must be typed into the calculator. The standard deviation calculator will then give the standard deviation of the data. In order to find the variance of the data, simply square the answer.