A Marine drill instructor recorded the time in which each of 11 recruits completed an obstacle course both before and after basic training.To test whether any improvement occurred,the instructor would use a t-distribution with 11 degrees of freedom.

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The instructor would use a t-distribution with 10 degrees of freedom because the degrees of freedom for a paired sample t-test is calculated as n - 1, where n is the number of pairs (in this case, 11 recruits), so 11 - 1 = 10.

A Marine Drill Instructor Recorded the Time in Which Each