Delta Air Lines wants to determine if the number of no-shows for flights originating from Detroit are higher than from Minneapolis.A sample of 20 flights from each city is taken and the number of no-shows is determined for each flight.Which nonparametric test would you use to determine whether the number of no-shows is greater in Detroit?
A) Wald-Wolfowitz one-sample runs test
B) Wilcoxon signed-rank test
C) Wilcoxon rank sum (Mann-Whitney)test
D) Kruskal-Wallis test

Question

Quizplus · Accepted Answer

The Wilcoxon rank sum (Mann-Whitney) test is appropriate for comparing two independent samples to determine if they come from populations with the same distribution. In this case, the two independent samples are the number of no-shows from Detroit and Minneapolis. The Wald-Wolfowitz one-sample runs test is used to determine if a sample comes from a population with a specified distribution, which is not the case here. The Wilcoxon signed-rank test is used for paired data, which is not the case here. The Kruskal-Wallis test is used to compare three or more independent samples, which is not the case here.

Delta Air Lines Wants to Determine If the Number of No-Shows