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Question: 9 a quality control engineer believes that cars produced on...

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9. A quality control engineer believes that cars produced on Friday have more defects. From past experience, the engineer believes that the mean number of defects for all cars is 3.6 with a standard deviation of 1.8. She tests 26 cars produced on Friday and finds the mean number of defects for these cars is 4.4 defects. Test to determine if Friday’s cars have more defects using the prob-value approach and α = 0.02.

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