The average number of hours for a random sample of mail order pharmacists from company A was 50.1 hours last year. It is believed that changes to medical insurance have led to a reduction in the average work week. To test the validity of this belief, the hypotheses are
a. H0: U > 50.1, Ha : U < 50.1.
b. H0: U = 50.1, Ha : U ? 50.1.
c. H0: U ? 50.1, Ha : U > 50.1.
d. H0: U ? 50.1, Ha : U < 50.1.
d
RATIONALE: The assumption to be challenged is last year's average. The alternative hypothesis comes from the fact that they believe there has been a reduction in the average work week. So the alternative hypothesis is Ha : u < 50.1 . The null is the complement of that: H0 : u ? 50.1.
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