Statistics

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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

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