A 90% Confidence Interval for the Average Salary of All

question 117

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 ($133,306, $150,733) .
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) Decrease the sample size and increase the confidence level.
• B) Increase the sample size and decrease the confidence level.
• C) Increase the sample size and increase the confidence level.
• D) Decrease the sample size and decrease the confidence level.

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