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13. An auto body repair shop plans its billing based on an average of 0.9 h to paint a car. The owner recently checked times

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13. An auto body repair shop plans its billing based on an average of 0.9 h to paint a car. The owner recently checked times for the last 50 cars painted and found that the average time for these cars was 1.2 h. She knows that the standard deviation is 0.4 h. Test the significance of this result at ( = 0.10

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