After You Calculate the Sample Size Needed to Estimate a Population

Multiple Choice

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.