A 95 confidence interval and a 99 confidence interval are co

A 95% confidence interval and a 99% confidence interval are computed from the same set of data. Which of the following statements is correct?

The 95% confidence interval is wider

The intervals have the same width.

The 99% confidence interval is wider.

You need to know the sample size, n, and the standard deviation to determine which interval is wider

Solution

The 99% confidence interval would be wider (larger margin of error) than the 95% confidence interval, because it allows one to be more confident that the unknown population parameter is contained within the interval.