Find the standard deviation of a data set, both sample and population, with the mean. Enter the numbers separated by commas.
Sample SD
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Standard deviation.Usage Tip
Use sample standard deviation (n − 1) unless your data is the entire population — it is the common default in statistics.
THE MATH
SD = √(average squared distance from the mean)
Sample divides by n − 1; population divides by n
Sample divides by n − 1; population divides by n
Standard deviation measures how spread out data is around the mean.
The sample version (n − 1) corrects for estimating from a sample; the population version (n) is for complete data.
The sample version (n − 1) corrects for estimating from a sample; the population version (n) is for complete data.
Enter two or more numbers separated by commas.
Sample SD is the default; population SD is shown alongside.
About 68 percent of normal data falls within one SD of the mean.
Sample SD is the default; population SD is shown alongside.
About 68 percent of normal data falls within one SD of the mean.