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 ($110,389, $128,192).
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 $110,389 to $128,192.

B) 90% of all CEOs in the electronics industry have salaries that fall between $110,389 to $128,192.

C) 90% of the sampled CEOs have salaries that fell in the interval $110,389 to $128,192.

D) We are 90% confident that the mean salary of the sampled CEOs falls in the interval $110,389 to $128,192.

Question

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 ($110,389, $128,192).
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 $110,389 to $128,192.

B) 90% of all CEOs in the electronics industry have salaries that fall between $110,389 to $128,192.

C) 90% of the sampled CEOs have salaries that fell in the interval $110,389 to $128,192.

D) We are 90% confident that the mean salary of the sampled CEOs falls in the interval $110,389 to $128,192.

Quizplus · Accepted Answer

The correct interpretation of a confidence interval is that we are 90% confident that the true mean salary of all CEOs in the electronics industry falls within the interval $110,389 to $128,192.

A 90% Confidence Interval for the Average Salary of All