Answered: to judge the effectiveness of an…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Transcribed Image Text: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 94 convenience store receipts the week before the ad campaign began, and found that 23 of them showed a purchase of the pretzels. Another simple random sample of 74 receipts was taken the week after the ad campaign, and 37 of them showed a pretzel purchase. Part: 0/2 Part 1 of 2 (a) Construct a 95% confidence interval for the difference between the proportions of customers purchasing pretzels before and after the ad campaign. Let p₁ denote the proportion of customers purchasing pretzels before the ad campaign and let p₂ denote the proportion of customers purchasing pretzels after the ad campaign. Use the TI-84 Plus calculator and round the answers to three decimal places. A 95% confidence interval for the difference between the proportion of customers purchasing pretzels before and after the X S ad campaign is <P1 P₂< Part: 1/2 Part 2 of 2 (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? ▼ the claim that the proportion of Because the confidence interval (Choose one) X 0, it (Choose one) customers who purchased pretzels did not change after the ad campaign. S

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