Coupons driving visits. A store randomly samples 603 shoppers over the course of a year and...
Coupons driving visits.
A store randomly samples 603 shoppers over the course of a year and finds that 142 of them made their visit because of a coupon they'd received in the mail. Construct a 95% confidence interval for the fraction of all shoppers during the year whose visit was because of a coupon they'd received in the mail.
Homework Answers
Answer
Given that
sample size n = 603
number of shoppers made visit (x) = 142
sample proportion p(hat) = x/n = 142/603 = 0.2355
z critical = 1.96 (using z table)
confidence interval =
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