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(Choose 1 answer)
☐ A
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 degrees of freedom_
A. 10
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sh the exam.
B. 11
C. 22
D. 20
E. None of the other choices is correct.
