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Author Question: A 90% confidence interval for the average salary of all CEOs in the electronics industry was ... (Read 177 times)

fox

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Question 1

A 90% confidence interval for the mean percentage of airline reservations being canceled on the day of the flight is (1.3%, 5%). What is the point estimator of the mean percentage of reservations that are canceled on the day of the flight?
◦ 3.7%
◦ 2.50%
◦ 3.15%
◦ 1.85%

Question 2

A 90% confidence interval for the average salary of all CEOs in the electronics industry was constructed using the results of a random survey of 45 CEOs. The interval was To make more useful inferences from the data, it is desired to reduce the width of the confidence interval. Which of the following will result in a reduced interval width?
◦ Decrease the sample size and decrease the confidence level.
◦ Decrease the sample size and increase the confidence level.
◦ Increase the sample size and increase the confidence level.
◦ Increase the sample size and decrease the confidence level.


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Marked as best answer by fox on Feb 14, 2020

Jayson

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fox

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Reply 2 on: Feb 14, 2020
Wow, this really help


shailee

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

 

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