A random sample of 250 students at a university finds that these students take a mean of 15.4 credit hours per quarter with a standard deviation of 2.2 credit hours. The 99% confidence interval for the mean is 15.4 ± 0.358. Interpret the interval.
A) We are 99% confident that the average number of credit hours per quarter of students at the university falls in the interval 15.042 to 15.758 hours.
B) 99% of the students take between 15.042 to 15.758 credit hours per quarter.
C) We are 99% confident that the average number of credit hours per quarter of the sampled students falls in the interval 15.042 to 15.758 hours.
D) The probability that a student takes 15.042 to 15.758 credit hours in a quarter is 0.99.

Question

Quizplus · Accepted Answer

The 99% confidence interval means we are 99% confident that the true average number of credit hours per quarter for all students at the university falls within the interval 15.042 to 15.758 hours.

A Random Sample of 250 Students at a University Finds