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An insurance company claims that the average automobile on the road today is less than 4 years old. A random sample of 15 cars had

An insurance company claims that the average automobile on the road today is less than 4 years old. A random sample of 15 cars had an average age of 5.4 years with a standard deviation of 1.1 years. Assume that the population is normally distributed. Test the claim at= 0.05.

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