A researcher who wants to reduce the magnitude of random sampling error in her study by half should ______.
A) double the sample size
B) triple the sample size
C) quadruple the sample size
D) there is nothing she can do to reduce random sampling error

Question

Quizplus · Accepted Answer

Quadrupling the sample size reduces the standard error (and thus the magnitude of random sampling error) by half, because the standard error of the mean is inversely proportional to the square root of the sample size.

A Researcher Who Wants to Reduce the Magnitude of Random