Performance Records for 18 Salespersons Are Selected to Investigate Whether

Multiple Choice

Performance records for 18 salespersons are selected to investigate whether compensation methods are a significant motivational factor. $\begin{array}{lc}\\ \text { Compensation Method } \quad\quad\text { Sales }\\\begin{array}{|l|l|l|l|l|l|l|l|}\hline \text { Straight Salary } & 18 & 12 & 22 & 28 & 28 & & \\\hline \text { Straight Commission } & 27 & 34 & 34 & 27 & 20 & 16 & 24 \\\hline \text { Salary plus Commission } & 11 & 17 & 27 & 14 & 30 & 22 & \\\hline\end{array}\end{array}$

A Kruskal-Wallis test is to be performed with $\alpha$ = 0.01.The critical chi-square value is _______.

A) 15.086
B) 13.277
C) 7.779
D) 9.210
E) 8.657