A 98% confidence interval estimate for a population mean $\mu$ is determined to be 75.38 to 86.52.If the confidence level is reduced to 90%,the confidence interval for $\mu$ :
A) Becomes wider.
B) Remains the same.
C) Becomes narrower.
D) None of these answers is correct.

Question

Quizplus · Accepted Answer

Reducing the confidence level from 98% to 90% results in a narrower confidence interval because a lower confidence level requires less certainty about where the true population mean lies, thus allowing the interval to be closer to the sample mean.

A 98% Confidence Interval Estimate for a Population Mean μ\muμ Is Determined to Be 75

A 98% Confidence Interval Estimate for a Population Mean $\mu$ Is Determined to Be 75