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A certain test preparation course is designed to help students improve their scores on the USMLE 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 6 students' scores on the exam after completing the course: 10, 18, 15, 14, 4, 14 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. Copy Data Step 3 of 4: Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places.

A certain test preparation course is designed to help students improve their scores on the USMLE 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 6 students' scores on the exam after completing the course: 10, 18, 15, 14, 4, 14 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. Step 4 of 4: Construct the 80% confidence interval. Round your answer to one decimal place. Copy Data