Question: what is the test value? I am getting different answers for this? Please help We have a random sample of 30 12 th grade students

what is the test value? I am getting different answers for this? Please help

We have a random sample of 30 12^th grade students who can do 25 pushups on average, with a sample standard deviation of 9, after completing a special physical education program. Does this value of 25 differ significantly from the population value of 20?

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