$$\text { Find the critical value } z _ { \alpha / 2 } \text { needed to construct a(n) } 79 \% \text { confidence interval. }$$
A) 1.25
B) 0.97
C) 0.81
D) 1.98

Question

Quizplus · Accepted Answer

The confidence level is 79%, which means $\alpha = 1 - 0.79 = 0.21$. Thus, $\alpha/2 = 0.105$. Looking up 0.105 in the z-table (or using a calculator or software that can find z-scores for given tail probabilities), we find the z-score that corresponds to the area to the left of $z_{\alpha/2}$ is approximately 1.25.

Find the critical value zα/2 needed to construct a(n) 79% confidence interval. \text { Find the critical value } z _ { \alpha / 2 } \text { needed to construct a(n) } 79 \% \text { confidence interval. } Find the critical value zα/2​ needed to construct a(n) 79% confidence interval.

$\text { Find the critical value } z _ { \alpha / 2 } \text { needed to construct a(n) } 79 \% \text { confidence interval. }$