To compare the times to failure of radar transponders made by firms A, B and C using an airline’s sample data, which test may be used?

1. A Option A: Kruskal-Wallis test
2. B Option B: Wilcoxon Rank-Sum test
3. C Option C: Kolmogorov-Smirnov test
4. D Option D: Spearman Rank Correlation test

Answer checked 11 October 2026 · How we write and check questions