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miss Akunina [59]
3 years ago
12

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

e beginning and end of the course to determine the effectiveness of the course. The following measurements are the net change in 4 students' scores on the exam after completing the course: 11,13,9,8 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 1 of 4: Calculate the sample mean for the given sample data. Round your answer to one decimal place.
Mathematics
1 answer:
sasho [114]3 years ago
6 0

Answer:

Step-by-step explanation:

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