SCENARIO 9-4 A drug company is considering marketing a new local anesthetic. The effective time of the anesthetic the drug company is currently producing has a normal
distribution with a mean of 7.4 minutes with a standard deviation of 1.2 minutes. The
chemistry of the new anesthetic is such that the effective time should be normally
distributed with the same standard deviation, but the mean effective time may be lower. If it
is lower, the drug company will market the new anesthetic; otherwise, they will continue to
produce the older one. A sample of size 36 results in a sample mean of 7.1. A hypothesis
test will be done to help make the decision.
Referring to Scenario 9-4, the appropriate hypotheses are:
a) H:/= 7.4 versus H. : !1 * 7.4
b) H:15 7.4 versus H, : 11> 7.4
c) Hu2 7.4 versus Hu< 7.4
d) H-> 7.4 versus H, 137.4

Referring to Scenario 9-4, for a test with a level of significance of 0.10, the critical value
would be

True or False: Referring to Scenario 9-4, the null hypothesis will be rejected with a level of
significance of 0.10.​