What statistical measure is used to describe sample variability?
126 views · Published 16 January 2015 · 5:15 · Indexed 29 October 2026
Channel: Nikolay's Genetics Lessons · 2015 · Education
What does variance measure? The term variance refers to a statistical measurement of the spread between numbers in a data set. More specifically, variance measures how far each number in the set is from the mean and thus from every other number in the set. Variance is often depicted by this symbol: σ2. How do you measure variance? The variance is the average of the squared differences from the mean. To figure out the variance, first calculate the difference between each point and the mean; then, square and average the results. For example, if a group of numbers ranges from 1 to 10, it will have a mean of 5.5.
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