When a researcher moves from a 90% confidence level to a 95% confidence level, the width of the confidence interval for the mean is ______.
A) increased
B) unchanged
C) less significant
D) decreased

Question

Quizplus · Accepted Answer

Increasing the confidence level from 90% to 95% increases the level of certainty that the calculated confidence interval truly contains the population mean. However, this increased level of certainty requires a wider range of values to be included in the interval, resulting in an increased width of the confidence interval.

When a Researcher Moves from a 90% Confidence Level to a 95