A) A company found that 27 out of 150 of its products were defective after retraining its
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A) A company found that 27 out of 150 of its products were defective after retraining its employees. If the company normally has a 40% defective product rate, find the critical value to determine if retraining the employees helped to minimize the number of defective products.
B) 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.
Related Book For
Essentials of Statistics for the Behavioral Sciences
ISBN: 978-1285056340
8th Edition
Authors: Frederick J Gravetter, Larry B. Wallnau
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