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A group of students has collected data from a random sample. They need to decide between a $95\%$ confidence interval and a $99\%$ confidence interval.

How will these intervals differ?

A

The $95\%$ confidence interval will be wider than the $99\%$ confidence interval.

B

The $99\%$ confidence interval will be wider than the $95\%$ confidence interval.

C

The $95\%$ confidence interval and $99\%$ confidence interval will be the same length, as they are both from the same random sample.

D

To determine which confidence interval will be wider, we need to know the sample size.

E

To determine which confidence interval will be wider, we need to know whether the students used the population variance or the sample variance.

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