Did the additive improve gas mileage

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Reference no: EM13933723

Fuel Efficiency of Automobiles Twelve automobiles were tested to see how many miles per gallon each one obtained. Under similar driving conditions, they were tested again, using a special additive. The data are shown here. At a = 0.05, did the additive improve gas mileage? Use the Wilcoxon signed-rank test.

	Before			After
13.6		18.3	22.6		23.7
18.2		19.5	21.9		20.8
16.1		18.2	25.3		25.3
15.3		16.7	28.6		27.2
19.2		21.3	15.2		17.2
18.8		17.2	16.3		18.5

Reference no: EM13933723

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