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) $2.33$

Question

Quizplus · Accepted Answer

For a 99% confidence level, the critical value $z_{\alpha/2}$ is found in the z-table corresponding to the tails of the distribution (1 - 0.99 = 0.01, so 0.005 in each tail since it's two-tailed), which is approximately 2.575.

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

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