According to a paid promotional article in The Globe and Mail, installation of an automotive accessory called
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Use the Wilcoxon signed-ranks test.
a. Assume that the tested cars are representative of cars in general, and use the Wilcoxon signed-ranks test at the 0.05 level of significance. Test the claim that the P.V.I, additive does affect vehicles' gas mileage.
b. Note that the vehicles tested in this example were not randomly selected, and in fact they all represent the same model of car under standardized conditions. Is the assumption made in part (a), that the test results can be potentially applied to all cars, a reasonable one? Explain why or why not.
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a Let Without PVI WO be group 1 Claim the populations have the same distribution n 15 nonzero ranks ...View the full answer
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