Question: Two fuel additives are tested to determine their effect on miles per gallon for passenger cars. Test results for 12 cars follow; each car was

Two fuel additives are tested to determine their effect on miles per gallon for passenger cars. Test results for 12 cars follow; each car was tested with both fuel additives. Use Î± = .05 and the Wilcox on signed-rank test to see whether there is a significant difference between the median miles per gallon for the additives.

Additive Additive Car Car 2 18.05 21.77 2 16.16 17.20 18.55 21.87 20.03 24.23 21.15 23.21 22.78 25.02 23.70 20.12 23.56 14.98 22.03 22.57 19.15 21.23 24.77 17.06 21.22 23.80 10 12

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