A sample of n = 135 students was asked the number of credit hours for which they were enrolled during the current semester. The sample mean was 13.67 and a standard deviation of 1.16. Find the 95% confidence interval for the mean number of credit hours which the population of students is enrolled.

(14.47, 14.87)

(13.57, 13.77)

(13.47, 13.87)

(10.7, 16.7)