You plan to use a conservative margin of error of 2%. How large a sample size do you need?
A) 100
B) 400
C) 2500
D) None of the above

Question

Quizplus · Accepted Answer

To achieve a conservative margin of error of 2% using the formula for margin of error in a proportion (which assumes a 50/50 split for maximum sample size), the sample size needed is $n = \left(\frac{1.96}{0.02}\right)^2 = 2401$, which is approximately 2500. This formula assumes a 95% confidence level.

You Plan to Use a Conservative Margin of Error of 2