A 90% Confidence Interval for the Average Salary of All

question 113

Multiple Choice

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
($100,951, $115,349) . 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?

• A)Increase the sample size and decrease the confidence level.
• B)Increase the sample size and increase the confidence level.
• C)Decrease the sample size and increase the confidence level.
• D)Decrease the sample size and decrease the confidence level.

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