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{"ops":[{"insert":"A factory manufactures cars with a warranty of 5 years on the engine and transmission.\u00a0An engineer believes that the engine or transmission will malfunction in less than 5 years.\u00a0He tests a sample of 40 cars and find the average time to be 4.8 years with a standard deviation of 0.50. At a 2% confidence level, is there enough evidence to support the idea that the warranty should be revised ?\u00a0( P-value Test)\n"}]}
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