Brand A gasoline was used in 16 similar automobiles under identical conditions. The corresponding sample of 16
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Brand A gasoline was used in 16 similar automobiles under identical conditions. The corresponding sample of 16 values (miles per gallon) had mean 19.6 and standard deviation 0.4. Under the same conditions, high-power brand B gasoline gave a sample of 16 values with mean 20.2 and standard deviation 0.6. Is the mileage of B significantly better than that of A? Test at the 5% level; assume normality. First guess. Then calculate.
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Solution Step 1 Find the sample mean for each brand Solution Step 2 The sample standard deviation is ...View the full answer
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