campaign. 1. Find the point estimate. 2. Find the standard error. Round to four decimal places. 3. Find the margin of error. Round to four decimal places.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter4: Equations Of Linear Functions
Section: Chapter Questions
Problem 8SGR
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In order to judge the effectiveness of an advertising campaign for a certain brand of pretzel, a company obtained a simple random sample of 80 convenience store receipts the week before the ad campaign began, found that 16 of them showed a purchase of the pretzels. Another simple random sample of 50 receipts was taken the week after the ad campaign and 28 of them showed a pretzel purchase. Construct a 98% confidence interval for the difference between the proportions of customers purchasing pretzels before and after the ad campaign. Let p1 be the population proportion of convenience store receipts showed a purchase of the pretzels taken in the week before the ad campaign began, and p2 be the population proportion of convenience store receipts showed a purchase of the pretzels taken in the week after the ad campaign. 1. Find the point estimate. 2. Find the standard error. Round to four decimal places. 3. Find the margin of error. Round to four decimal places.
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