Learn how to calculate population variance using a simple formula and examples. Population variance measures the average squared distances of data points from the mean and indicates how data points spread out in the population. Use the calculator to estimate the variance of a population from a sample of data. Learn how to calculate population variance for ungrouped and grouped data using formulas and examples. Population variance is a measure of dispersion that indicates the spread of data in a data set.
Enter a data set and get variance, standard deviation, mean and sum of squares. Population variance tells us how data points in a population are spread out. It is the average of the distances from each data point in the population to the mean, squared. The square root of the population variance is called the population standard deviation, which represents the average distance from the mean. Learn how to calculate variance for population and sample data using formulas and a calculator. Variance is a measure of variability that tells you the degree of spread in your data set. You should calculate the population variance when the dataset youre working with represents an entire population, i. e. Every value that youre interested in. The following examples show different scenarios of when to calculate the sample variance vs.
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