A researcher wishes to determine whether there is a difference in the average age of middle school, high school, and college teachers. Teachers are randomly selected. Their ages are recorded below. Use

Which of the following is a correct statement about the means?

◦ There is not enough evidence to suggest that the means are different.
◦ The mean age of middle school teachers is different from the mean age of high school teachers.
◦ The mean age of high school teachers is different from the mean age of college teachers.
◦ The mean age of middle school teachers is different from the mean age of college teachers.