Comparing the times to failure of radar transponders made by firms A, B, and C based on an airline's sample experience with the three types of instruments one may use____________?
Correct answer: D. Kruskal-Wallis test
- A. Kolmogorov-Smirnor test
- B. Wilcoxon Rank-Sum test
- C. Spearman Rank Correlation test
- D. Kruskal-Wallis test
Explanation
The three firms provide three independent groups whose failure-time distributions or locations are being compared. Kruskal-Wallis extends the rank-sum approach from two groups to three or more, so it is the appropriate choice.
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