A 90% confidence interval estimate for a population mean is determined to be 72.8 to 79.6.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 72.8 to 79.6.If the confidence level is reduced to 80%,the confidence interval for  becomes narrower.

Quizplus · Accepted Answer

When the confidence level is decreased, the confidence interval becomes narrower as the degree of certainty required in the estimate is lower. Therefore, the statement is true.

A 90% Confidence Interval Estimate for a Population Mean