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HYPOTHESES TESTING REGARDING EN- GINEERING TRAINING PROGRAMS

Assume that the test results shown in Example 15.1 are random samples from normal populations. (1) At a signi?cance level of α = 0.05, test the hypothesis that the mean score for trainees using method A is μA = 75, versus the alternative that it is less than 75. (2) Also, at the same signi?cance level, test the hypothesis that the mean score for trainees using method B is μB = 75, versus the alternative that it is not.

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