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 ranks test
B)Wilcoxon rank sum test
C)Sign test
D)Kruskal-Wallis test
E)Spearman's rank correlation test

Question

Quizplus · Accepted Answer

The Kruskal-Wallis test is appropriate for comparing the effectiveness of three programming languages when data is highly skewed with extreme outliers. It is a nonparametric test that compares the medians of three or more groups. The Wilcoxon signed ranks test and sign test are appropriate for paired samples, while the Wilcoxon rank sum test is appropriate for two independent samples. Spearman's rank correlation test is used to assess the strength and direction of association between two variables.

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