Question

ch 16 if the confidence level is increased from 90% to 99% for an srs of size n, the width of the confidence interval for the mean μ will
○ stay the same.
○ decrease.
○ increase.

Explanation:

A higher confidence level requires a wider interval to be more certain that the true population mean is captured. As the confidence level increases from 90% to 99%, we want to be more confident that the interval contains the mean $\mu$. This is achieved by increasing the width of the confidence interval.

Answer:

C. increase