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.

Question

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 $139,048 to $154,144.

A 90% Confidence Interval for the Average Salary of All