The test statistic for a problem involving any sample size and an unknown population standard deviation is the Student's t distribution.

Name: The test statistic for a problem involving any sample size and an unknown population standard deviation is the Student's t distribution.
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Quizplus · Accepted Answer

This is true. When the population standard deviation is unknown and the sample size is small (less than 30), the appropriate test statistic to use is the Student's t distribution.

The Test Statistic for a Problem Involving Any Sample Size