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A teacher gives 200 students a study guide for a test and the average score was 90 with a standard deviation of 6. She did not...Asked by Bert
10. A teacher gives 200 students a study guide for a test and the average score was 90 with a standard deviation of 6. She did not give the other 200 students a study guide and their average score was 70 with a standard deviation of 8. Find the critical value to determine whether or not the study guide helped students to increase their test score.
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