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Some manufacturers claim that non-hybrid sedan cars have a lower mean miles-pergallon (mpg) than hybrid ones. Suppose that consumers test 252 hybrid sedans and get

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Some manufacturers claim that non-hybrid sedan cars have a lower mean miles-pergallon (mpg) than hybrid ones. Suppose that consumers test 252 hybrid sedans and get a mean of 24.75 mpg with a standard deviation of 6 mpg. Also, 245 non-hybrid sedans get a mean of 23.75 mpg with a standard deviation of 9 mpg. Suppose that both populations are known to be normal distributed. Conduct a hypothesis test to evaluate the manufacturers' claim. Test at a 10% level of significance. Let population 1 denote non-hybrids and population 2 denote hybrids. (f) What is the p-value? Round your answer to three decimal places. Maple plot

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