Answered: Pretzels: In order to judge the…

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 98 convenience store receipts the week before the ad campaign began, and found that 26 of them showed a purchase of the pretzels. Another simple random sample of 78 receipts was taken the week after the ad campaign, and 41 of them showed a pretzel purchase. Part: 0 / 2 Part 1 of 2 (a) Construct a 99.5% confidence interval for the difference between the proportions of customers purchasing pretzels before and after the ad campaign. 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. Let A 99.5% confidence interval for the difference between the proportion of customers purchasing pretzels before and after the <-.223 ad campaign is -.253 <P₁¯P2 ☑

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