Answer to Question #163480 in Statistics and Probability for HILDA DIANO

Question

A factory manufactures cars with a warranty of 5 years on the engine and transmission. An engineer believes that the engine or transmission will malfunction in less than 5 years. He 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 ? ( P-value Test)

Answer 1

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