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Author Question: The average monthly electric bill of a random sample of 256 residents of a city is $90 with a ... (Read 57 times)

olivia_rose

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on: Mar 25, 2023

Question 1

Six hundred consumers were asked whether they would like to purchase a domestic or a foreign automobile. Their responses are given below.

Preference

Frequency

Domestic

240

Foreign

360


Develop a 95% confidence interval for the proportion of all consumers who prefer to purchase domestic automobiles.



Question 2

The average monthly electric bill of a random sample of 256 residents of a city is $90 with a standard deviation of $24.

a.Construct a 90% confidence interval for the mean monthly electric bills of all residents.
b.Construct a 95% confidence interval for the mean monthly electric bills of all residents.

Essentials of Statistics for Business and Economics ¦ Anderson, Sweeney, Williams, Camm, Cochran ¦ 7th Edition
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Marked as best answer by olivia_rose on Mar 25, 2023

BryanAultm

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Reply #1 on: Mar 25, 2023
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olivia_rose

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Reply 2 on: Mar 25, 2023
Great answer, keep it coming :)

atrochim

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Reply 3 on: Yesterday
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