Suppose That Six Different E-Readers Were Evaluated by Two Senior

Suppose that six different e-readers were evaluated by two senior citizen groups
With respect to their suitability for use among the older segment of the population. The
Rankings from 1 (best) to 6 (worst) are shown below. To determine if there is a difference
In the rankings between the two magazines, the appropriate nonparametric method is the $$\begin{array} { | c | c | c | } \hline \text { Model } & \text { Group 1 } & \text { Group 2 } \\\hline \text { Kindle 3 } & 1 & 1 \\\hline \text { Sony Reader } & 2 & 3 \\\hline \text { Kindle DX } & 3 & 2 \\\hline \text { Alex } & 4 & 6 \\\hline \text { Kobo eReader } & 5 & 4 \\\hline \text { COOL-ER } & 6 & 5 \\\hline\end{array}$$

A) Wilcoxon Rank-Sum test.
B) Wilcoxon Signed-Rank test.
C) Spearman's rho.
D) Kruskal Wallis test.
E) Kendall's tau.