The following screenshot shows how to calculate the standard deviation for the dataset using the three different standard deviation formulas: Suppose we have the following dataset in Excel: The following example shows how to use these functions in practice. However, when we only have a sample of the population then we have more uncertainty around the exact standard deviation of the overall population, so our estimate for the standard deviation needs to be larger. The reason the population standard deviation will be smaller is because if we know every value in the population, then we know the exact standard deviation. Since the formula for the population standard deviation divides by N instead of n-1, the population standard deviation will always be smaller than the sample standard deviation. It will return the exact same value as the STDEV.S function. STDEV: This function calculates the sample standard deviation as well. Sample standard deviation = √Σ (x i – x) 2 / (n-1)ģ. ![]() Use this function when the range of values represents a sample of values, rather than an entire population. STDEV.S: This function calculates the sample standard deviation. Population standard deviation = √Σ (x i – μ) 2 / NĢ. ![]() This function uses the following formula: ![]() Use this function when the range of values represents the entire population. STDEV.P: This function calculates the population standard deviation. There are three different functions you can use to calculate standard deviation in Excel:ġ.
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