Which of the following descriptive statistic uses (?) for a population and (s) for a sample?

Question

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Standard deviation uses (?) for a population and (s) for a sample.
Key Takeaway: Standard deviation is a descriptive statistic that takes into account how each data point deviates from the average of a data set. Standard deviation is an important measure of data scatter around a mean which is also an important aspect of a process' variation. In Six Sigma methodology, the best way to reduce the inefficiencies of a process is to reduce its variation.

Which of the Following Descriptive Statistic Uses (?) for a Population