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Author Question: The economics department secretary wants to estimate the average number of bottled drinks sold each ... (Read 89 times)

armygirl

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on: Jun 24, 2018
The economics department secretary wants to estimate the average number of bottled drinks sold each day out of the vending machine. Similar vending machine sales have a standard deviation of 9 bottles per day. He wants to be 95-percent confident that the estimate, x, obtained is within 3 bottles of the true mean . How large a sample is needed if the limit of the Coke machine for one day is 120?

Question 2

As marketing manager for a very large discount building supply, you wish to know what proportion of your city's population conducted do-it-yourself home improvement projects during the past year. The national percentage is 62; therefore, you decide to use this value in estimating sample size for a study to achieve 90 confidence with the estimate no more than 5 from the true proportion. If you know that the total city population is 30,000, what is the appropriate sample size?


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cupcake16

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Reply #1 on: Jun 24, 2018
Answer to Question 1

27

Answer to Question 2

253


armygirl

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Reply 2 on: Jun 24, 2018
Gracias!

xoxo123

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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