Question

A grocery store chain has been tracking data on the number of shoppers that use coupons. The data shows that 71% of all shoppers use coupons. 18 times out of 20 these results were considered accurate to within 2.5%. What is the confidence interval? Question 23 options:

Answer 1

Confidence Interval = (p-E, p+E) = (0.71-0.025, 0.71+0.025) = (0.685, 0.735)