![]() ![]() Since you collect data from every population member, the standard deviation reflects the precise amount of variability in your distribution, the population.īut when you use sample data, your sample standard deviation is always used as an estimate of the population standard deviation. When you have population data, you can get an exact value for population standard deviation. Samples are used to make statistical inferences about the population that they came from. Why use n – 1 for sample standard deviation? If you have data from a sample, use the sample standard deviation formula: Formula If you have data from the entire population, use the population standard deviation formula: Formula Standard deviation formula for populations This means that on average, each score deviates from the mean by 95.54 points. The standard deviation of your data is 95.54.
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