![]() 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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