Question: Refer to Exercise 12-19. Find a 90% confidence interval for the difference in the mean effectiveness of program 1 and the average of those using

Refer to Exercise 12-19. Find a 90% confidence interval for the difference in the mean effectiveness of program 1 and the average of those using programs 2 and 3.

Training Programs Years of Experience 0-5 5-10 10-15 70 75 87 65 80 82 81 87 94

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