After you calculate the sample size needed to estimate a population proportion to within 0.05, your statistics lecturer tells you the maximum allowable error must be reduced to just 0.025. If the original calculation led to a sample size of 400, the sample size will now have to be:
A)800.
B)200.
C)4000.
D)1600.

Question

Quizplus · Accepted Answer

To decrease the maximum allowable error from 0.05 to 0.025, the sample size needs to be doubled. Therefore, the new sample size will be 400 x 2 = 800.

After You Calculate the Sample Size Needed to Estimate a Population