Answer to Question #149949 in General Chemistry for desiree miranda

Question

A certain test preparation course is designed to help students improve their scores on the GMAT exam. A mock exam 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 7

 students' scores on the exam after completing the course: 20,18,2,4,15,15,10

Using these data, construct a 80%

 confidence interval for the average net change in a student's score after completing the course. Assume the population is approximately normal

Answer 1

20,18,2,4,15,15,10.

20+18+2+4+15+15+10/7=12.

12±9.6