Author Question: The average monthly electric bill of a random sample of 256 residents of a city is $90 with a ... (Read 23 times)

olivia_rose · **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.

BryanAultm · **Reply #1 on:** Mar 25, 2023

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