Which of the following will make a confidence interval narrower?
I. increase the confidence level.
II. take a larger sample. III. take a smaller sample.
A) I only
B) II only
C) III only
D) I and III
E) I and II

Question

Quizplus · Accepted Answer

Taking a larger sample will make the confidence interval narrower as it reduces the standard error of the estimate. Increasing the confidence level and taking a smaller sample will widen the confidence interval.

Which of the Following Will Make a Confidence Interval Narrower