A member of the city government thinks that 90 percent confidence isn't enough. He wants to be 99 percent confident. How would the margin of error of a 99 percent confidence interval compare with the 90 percent interval found for the same sample?

Question

Quizplus · Accepted Answer

A higher confidence level requires a larger margin of error because as the confidence level increases, the range of the possible values for the true population parameter also increases, so a larger margin of error is needed to capture that range.

A Member of the City Government Thinks That 90 Percent