Find the Rejection Region for the Specified Hypothesis Test $\mathrm { H } _ { 0 } : \mu = 9$

Multiple Choice

Find the rejection region for the specified hypothesis test.
-Consider a test of $\mathrm { H } _ { 0 } : \mu = 9$ . For the following case, give the rejection region for the test in terms of the $z$ -statistic: $\mathrm { H } _ { \mathrm { a } } : \mu < 9 , \alpha = 0.01$

A) $z < - 2.575$
B) $\mathrm { z } < - 2.33$
C) $z < 2.575$
D) $z > - 2.33$