Do One of the Following, as Appropriate: (A) Find the Critical

Multiple Choice

Do one of the following, as appropriate: (a) Find the critical value $z_{?/2}$ , (b) find the critical value $t_{?/2}$ , (c) state that neither the normal nor the t distribution applies
- $91 \% ; \mathrm { n } = 45 ; \sigma$ is known; population appears to be very skewed.

A) $z _ { \alpha / 2 } = 1.70$
B) $\mathrm { z } _ { \alpha / 2 } = 1.75$
C) $\mathrm { t } _ { \alpha / 2 } = 1.645$
D) $\mathrm { t } _ { \alpha / 2 } = 1.34$