Question: 12. Comparing Fuel Additives. Two fuel additives are tested to determine their effect on kilometers per liter for passenger cars. Test results for 12 cars

12. Comparing Fuel Additives. Two fuel additives are tested to determine their effect on kilometers per liter for passenger cars. Test results for 12 cars follow; each car was tested with both fuel additives. Use a = .05 and the Wilcoxon signed-rank test to see whether there is a significant difference between the median kilometers per liter for the additives.

Additive Additive Car 1 2 Car 1 2 1 8.51 7.64 7 6.84 7.28 2 9.97 9.21 8 7.85 6.34 3 9.32 9.55 9 9.25 8.47 4 8.10 7.22 10 10.25 8.95 5 8.98 8.98 11 9.82 9.64 6 10.48 10.07 12 10.58 10.03

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