Provide an Appropriate Response

Multiple Choice

Provide an appropriate response.
-Suppose you have obtained a confidence interval for µ, but wish to obtain a greater degree of precision. Which of the following would result in a narrower confidence interval?
A. Increasing the sample size while keeping the confidence level fixed
B. Decreasing the sample size while keeping the confidence level fixed
C. Increasing the confidence level while keeping the sample size fixed
D. Decreasing the confidence level while keeping the sample size fixed

A) A and D
B) B and D
C) A and C
D) B and C