Posted by
**John** on
.

Sorry to ask another question but I keep struggling with this class.

If all else remains the same, which of these will make a confidence interval for a proportion

narrower?

I. Increase the confidence level.

II. Increase the sample size.

III. Increase the margin of error.

A. I only

B. II only

C. I and II

D. I and III

E. I, II, and III