1. Use the sample variance formula if you're working with a partial data set. In most cases, statisticians only have access to a sample, or a subset of the ... 2. Write down the sample variance formula. The variance of a data set tells you how spread out the data points are. The closer the variance is to zero, the ... 3. Calculate the mean of the sample. The symbol x̅ or "x-bar" refers to the mean of a sample. Calculate this as you would any mean: add all the data points ...
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