After calculating the sample size needed to estimate a population proportion to within 0.04,your statistics professor told you the maximum allowable error must be reduced to just .01.If the original calculation led to a sample size of 800,the sample size will now have to be:
A)800
B)3,200
C)6,400
D)12,800

Question

Quizplus · Accepted Answer

To decrease the maximum allowable error from 0.04 to 0.01, we need to increase the sample size four times.

Original sample size = 800
New sample size = 4 x 800 = 3,200

Therefore, the best choice is D) 12,800.

After Calculating the Sample Size Needed to Estimate a Population