Question

At a certain grocery store 52% of the customers regularly use coupons.

What is the approximate standard deviation of the sampling distribution of the proportion for samples of size 240?

Answer 1

\[sd = \sqrt{\frac{ pq }{ n }}\]
where p is the sample proportion (0.52)
q is 1 - p
and n is the sample size (240)

plug in the appropriate quantities and evaluate sd