(Solved): A certain test preparation course is designed to heip studentsimprove their scores on the LSAT exam ...

A certain test preparation course is designed to heip studentsimprove their scores on the LSAT exam. A mock exam is given at the beginning and end of the course to determine the effectiveness of the course, The followns measurements are the net change in 4 students scores on the exam atter completing the course: \( 19,16,14,10 \) Using these data, construct a \( 90 \% \) confidence interval for the average net change in a student's score after completing the course. Assume the population is approximately normal. Step 2 of \( 4: \) Calculate the sample standard deviation for the given sample data. Round your answer to one decimal place.