If the researcher wishes to test the claim that the mean of the population is 75, the appropriate null hypothesis is:   a. ? ≤ 75 b. ? ≥ 75 c. ? ≠ 75 d. ? = 75

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Q: the .14 ,20 ,12,17 ,13 ,14 ,9 ,10 ,17 variance is 12.5 O 10.5 2.5

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