A 90% confidence interval estimate for a population mean is determined to be 62.8 to 73.4. If the confidence level is reduced to 80%, the confidence interval for becomes narrower.

Question

A 90% confidence interval estimate for a population mean  is determined to be 62.8 to 73.4. If the confidence level is reduced to 80%, the confidence interval for  becomes narrower.

Quizplus · Accepted Answer

When the confidence level is reduced, the corresponding interval becomes narrower as there is less certainty required to be accounted for in the estimate.

A 90% Confidence Interval Estimate for a Population Mean