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:
1 answer:
<span>Confidence Interval = (p-E, p+E) = (0.71-0.025, 0.71+0.025) = (0.685, 0.735) </span>
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