A certain test preparation course is designed to help students improve their scores on the GRE 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 66 students' scores on the exam after completing the course:
9,8,9,4,11,89,8,9,4,11,8
Using these data, construct a 80%80% confidence interval for the average net change in a student's score after completing the course. Assume the population is approximately normal.
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Step 2 of 4 :
Calculate the sample standard deviation for the given sample data. Round your answer to one decimal place.
A certain test preparation course is designed to help students improve their scores on the GRE...
A certain test preparation course is designed to help students improve their scores on the GRE 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 77 students' scores on the exam after completing the course: 15,12,−3,10,18,0,1315,12,−3,10,18,0,13 Using these data, construct a 80%80% confidence interval for the average net change in a student's score after completing the course. Assume the population...
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A certain test preparation course is designed to help students improve their scores on the GRE 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 55 students' scores on the exam after completing the course: 16,12,11,13,26 Using these data, construct a 95% confidence interval for the average net change in a student's score after completing the course. Assume the population...
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A certain test preparation course is designed to help students improve their scores on the LSAT exam. A mock test 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 test after completing the course: 20,26,20,11,19 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...