Since the population standard deviation σ is almost always known, we use it instead of the sample
standard deviation s when finding a confidence interval.

Name: Since the population standard deviation σ is almost always known, we use it instead of the sample standard deviation s when finding a confidence interval.
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Quizplus · Accepted Answer

The population standard deviation σ is often unknown, which is why we typically use the sample standard deviation s to estimate it when finding a confidence interval.

Since the Population Standard Deviation σ Is Almost Always Known