A 90% Confidence Interval for the Average Salary of All

question 59

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 ($130,852, $147,990) . 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) Decrease the sample size and decrease the confidence level.
• C) Increase the sample size and increase the confidence level.
• D) Decrease the sample size and increase the confidence level.

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Definitions:

Philadelphia

A city in the United States known for its rich history, including the signing of the Declaration of Independence and the Constitution.

United States

A country in North America, consisting of 50 states, known for its diverse culture and significant impact on global affairs.

Hospital

A healthcare institution providing patient treatment with specialized medical and nursing staff and medical equipment.

Thanatology

The scientific study of death and the practices associated with it, including the study of the needs of the terminally ill and their families.