Standard deviation in statistics refers to how much deviation there is from the average or mean value. Sample deviation refers to the data that was collected from a smaller pool than the population.
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The standard deviation of the population. the standard deviation of the population.
Yes
Here's how you do it in Excel: use the function =STDEV(<range with data>). That function calculates standard deviation for a sample.
You're an idiot. It's standard deviation. Google that for your answer.
When the sample size is small