The width of a confidence interval estimate for a proportion will be narrower for 90% confidence than for 95% confidence.

Question

Quizplus · Accepted Answer

A confidence interval is a range of values that is likely to contain the true population proportion. The wider the interval, the less precise the estimate. A higher confidence level requires a wider interval to provide a greater level of certainty that the true proportion is included within the interval. Therefore, as the confidence level decreases, the interval becomes narrower, resulting in a more precise estimate.

The Width of a Confidence Interval Estimate for a Proportion