When the population standard deviation, σ, is unknown the sample standard deviation, s, is used in determining the interval estimate for the population mean.

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Quizplus · Accepted Answer

When the population standard deviation (σ) is unknown, the sample standard deviation (s) is used as an estimate for σ in calculating the interval estimate for the population mean, typically in the context of constructing confidence intervals.

When the Population Standard Deviation, σ, Is Unknown the Sample