Q:

What formula is used to find a sample variance?

A:

Quick Answer

The formula to find a sample variance is as follows: s squared equals sigma(x-x-bar)squared over n-1. Working out the problem involves determining the mean, subtracting the mean for each number and then squaring the result and then determining the average of the squared differences.

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Full Answer

In math, variance will always be a nonnegative. In statistics and probability, variance tells someone how spread out a set of numbers are. All values are identical when there is a variance of zero. Those performing statistics use the sample mean to estimate the population mean. It works to measure location and the symbol is usually an x-bar.

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