A refrigerator manufacturer claims that the mean life of its competitor's refrigerators is less than 18 years. You are asked to perform a hypothesis test to test this claim.   ​(a) How would you write the null and alternative hypothesis if you represent the manufacturer and want to support the​ claim? ​(b) How would you write the null and alternative hypothesis if you represent the competitor and want to reject the​ claim?

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A: Feel free to ask further question.

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