A Marine boot camp instructor recorded the time in which each of 15 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 15 degrees of freedom.

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The instructor would use a t-distribution with 14 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, 15 recruits), so 15 - 1 = 14.

A Marine Boot Camp Instructor Recorded the Time in Which