A research team believes that the systolic blood pressure of adult males is normally distributed with a population variance equal to 256. A simple random sample of 25 males selected from the adult male population had a mean systolic blood pressure reading of 123. Let

denote the mean systolic blood pressure of adult males. Suppose the research team wants to test, at the 5% level of significance, whether the mean systolic blood pressure of adult males is not equal to 120. Suppose the assumptions of this hypothesis test are satisfied.

A. What are the null and alternative hypotheses, and level of significance for the hypothesis test stated in the preamble of Section D

B.What is the test statistic and its distribution for the hypothesis test stated in the preamble of Section D

C.What is the observed test statistic for the hypothesis test stated in the preamble of Section D

D.What is thep-value for the hypothesis test stated in the preamble of Section D