Construct and Interpret a Confidence Interval for a Pop Mean $\mathrm { z } \alpha / 2$

Multiple Choice

Construct and Interpret a Confidence Interval for a Pop Mean, Assuming that the Pop Std Dev is Known
-Compute the critical value $\mathrm { z } \alpha / 2$ that corresponds to a $99 \%$ level of confidence.

A) $2.575$
B) $1.96$
C) $1.645$
D) $2.33$