Eight Hybrid Cars Are Used to Determine If There Is

Eight hybrid cars are used to determine if there is a difference in gas mileage (MPG) with and without an additive claimed to increase the fuel efficiency.The appropriate nonparametric method to use for these data is the ________________________ .

A) Kruskal-Wallis test
B) Kendall's tau
C) Wilcoxon signed-rank test
D) Wilcoxon rank sum test
E) Spearman's rho