A record store owner finds that 20% of customers entering her store make a purchase. One morning

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A record store owner finds that 20% of customers entering her store make a purchase. One morning 180 people, who can be regarded as a random sample of all customers, enter the store.

a. What is the mean of the distribution of the sample proportion of customers making a purchase?

b. What is the variance of the sample proportion?

c. What is the standard error of the sample proportion?

d. What is the probability that the sample proportion is less than 0.15?

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Statistics For Business And Economics

ISBN: 9781292315034

9th Global Edition

Authors: Paul Newbold, William Carlson, Betty Thorne

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Question Posted: Nov 14, 2022 02:24 AM

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A record store owner finds that 20% of customers entering her store make a purchase. One morning

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Statistics For Business And Economics

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