Consider a Test Of $\mathrm { H } _ { 0 } : \mu = 12$

Multiple Choice

Consider a test of $\mathrm { H } _ { 0 } : \mu = 12$ . For the following case, give the rejection region for the test in terms of the $z$ -statistic: $\mathrm { H } _ { \mathrm { a } } : \mu < 12 , \alpha = 0.10$

A) $z < - 1.645$
B) $\mathrm { z } < - 1.28$
C) $z > - 1.28$
D) $\mathrm { z } < 1.645$