Measures of Variation Worksheet Population Mean, Population Variance, Population Standard Deviation, Sample Mean, Sample Variance, Sample Standard Deviation, and Sum of Squares Perfect for an in-class assignment, homework, or assessment. The Measures of Variation Worksheet is a two-page worksheet with real-life data sets. Questions involve finding the mean, sum of squares, variation, and standard deviation of both a sample and a population. A detailed answer key is included to make grading or