City Officials Want to Estimate the Proportion of Visitors Who

City officials want to estimate the proportion of visitors who are repeat visitors to the Rideau Canal Skateway. Suppose they find they need a sample size of 15,000 people to achieve a margin of error of 0.01 percentage points with 99 % confidence. This sample is too large to be practical. How can they reduce the sample size?

A) Use a lower confidence level.
B) Use a smaller margin of error.
C) Use a higher level of confidence.
D) Conduct a census.
E) Use a higher confidence level and a smaller margin of error.