A 90% Confidence Interval for the Average Salary of All

question 18

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 ($139,048, $154,144) . Give a practical interpretation of the interval.

• A) We are 90% confident that the mean salary of all CEOs in the electronics industry falls in the interval $139,048 to $154,144.
• B) 90% of all CEOs in the electronics industry have salaries that fall between $139,048 to $154,144.
• C) We are 90% confident that the mean salary of the sampled CEOs falls in the interval $139,048 to $154,144.
• D) 90% of the sampled CEOs have salaries that fell in the interval $139,048 to $154,144.

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