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Business, 06.12.2021 17:10 gabbycasey102

Pretzels In order to judge the effectiveness of an advertising campaign for a certain brand of pretzel, a company obtained a simple random sample of convenience store receipts the week before the ad campaign began, and found that of them showed a purchase of the pretzels. Another simple random sample of receipts was taken the week after the ad campaign, and of them showed a pretzel purchase. Required:
a. Construct a 98% confidence interval for the difference between the proportions of customers purchasing pretzels before and after the ad campaign.
b. A marketing manager claims that the proportion of customers who purchased pretzels did not change after the ad campaign. Does the confidence interval contradict this claim?

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