A 95% confidence interval for a population mean is determined to be 100 to 120. If the confidence coefficient is reduced to 0.90, the interval for μ
A) becomes narrower
B) becomes wider
C) does not change
D) becomes 0.1

Question

Quizplus · Accepted Answer

Reducing the confidence level from 95% to 90% decreases the margin of error, resulting in a narrower confidence interval.

A 95% Confidence Interval for a Population Mean Is Determined