Is it significant More than 200,000 people worldwide take
Chapter , Problem 6.90(choose chapter or problem)
Is it significant? More than 200,000 people worldwide take the GMAT examination each year when they apply for MBA programs. Their scores vary Normally with mean about m 525 and standard deviation about s 100. One hundred students go through a rigorous training program designed to raise their GMAT scores. Test the following hypotheses about the training program H0: m 525 Ha: m 525 in each of the following situations. (a) The students average score is x 541.4. Is this result significant at the 5% level? (b) Now suppose that the average score is x 541.5. Is this result significant at the 5% level? (c) Explain how you would reconcile this difference in significance, especially if any increase greater than 15 points is considered a success. USE
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