A certain test preparation course is designed to help students
improve their scores on the USMLE. A mock work is given at the
beginning and end of the course to determine the effectiveness of
the course. The following measurements are the net change in 5
students' scores on the work after completing the course:
7,8,6,8,5
Using these data, construct a 98% confidence interval for the
average net change in a student's score after completing the
course. Assume the population is approximately normal.
Step 1 of 4 : Calculate the sample mean for the given sample
data. Round your answer to one decimal place.