When small samples are used to estimate the true population mean where the population standard deviation is unknown, the t distribution must be used to obtain the critical value.

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Quizplus · Accepted Answer

This statement is true. When the population standard deviation is unknown and the sample size is small, the t distribution should be used to calculate the critical value for hypothesis testing or constructing confidence intervals for the population mean. The t distribution takes into account the increased uncertainty due to the smaller sample size.

When Small Samples Are Used to Estimate the True Population