An e-business/e-commerce information technology consulting company wants to compare the effectiveness of three programming languages that its programmers use.Currently each programming language is used by approximately 1/3 of the programmers employed by the company.The director of the programming division randomly selected 5 programmers from the users of each of the three programming languages and assigned the same simple programming task to each programmer.It is known that all three populations have highly skewed distributions with extreme outliers.Which one of the following nonparametric tests is appropriate for this problem?
A)Wilcoxon signed rank test
B)Wilcoxon rank sum test
C)Sign test
D)Kruskall-Wallis test
E)Spearman's rank correlation test

Question

Quizplus · Accepted Answer

The Kruskall-Wallis test is appropriate for comparing the effectiveness of three or more groups and does not assume normality or equal variances. As the populations have highly skewed distributions with extreme outliers, nonparametric tests are suitable for this problem. The Wilcoxon signed rank test is used for comparing two related samples, the Wilcoxon rank sum test for comparing two independent samples, the sign test for comparing matched pairs, and Spearman's rank correlation test for testing the association between two variables.

An E-Business/e-Commerce Information Technology Consulting Company Wants to Compare the Effectiveness