![]() ![]() In the other class, the variance of grades is very high. Yet, in one class, the variance of grades is very low. ![]() Both professors have agreed to aim for a class average of 85-a B letter grade. Imagine there are two statistics classes taught by two different professors. You can’t get this information by only using measures of center such as:Ī low variance tells you your data is clustered closely around the mean and does not vary much.Ī high variance tells you your data is dispersed widely around the mean and varies quite a bit. Measures of spread like variance are important in statistics because they give you additional information about your data. ![]() We calculate variance as the average of the squared deviations from the mean. Variance is a parameter or a statistic that measures how spread-out data is relative to its mean. When to Use the Sample or Population VarianceĬalculating Variance in Excel, Google Sheets, R and Desmos ![]()
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