![]() ![]() Or you may have randomly obtained values that are far more scattered than the overall population, making the SD high. But how accurate is that standard deviation? Just by chance, you may have happened to obtain data that are closely bunched together, making the SD low. It is straightforward to calculate the standard deviation from a sample of values. The Standard Deviation of a sample is not the same as the Standard Deviation of the population A confidence interval can be computed for almost any value computed from a sample of data, including the standard deviation (SD).
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