When conducting a hypothesis test concerning the population mean, and the population standard deviation is unknown, the value of the test statistic is calculated as ________. A) z = B) t_df = C) z = D) t_df =

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When the population standard deviation is unknown, we use the t-distribution for the hypothesis test. Therefore, the value of the test statistic is calculated as t_df.

When Conducting a Hypothesis Test Concerning the Population Mean, and the Population