1 pt Holding everything else constant which change to the sa

(1 pt) Holding everything else constant, which change to the sample size will reduce the width of a confidence interval for a population mean by half?

A. Square the sample size.
B. Half the sample size.
C. Raise the sample size to the power 4.
D. Double the sample size.
E. Quadruple the sample size.

Solution

Because sample size appears in square root in denominator of margin of error, to get half margin of error, we need to:
E. Quadruple the sample size.