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)Kruskal-Wallis test
E)Spearman's rank correlation test

Question

Quizplus · Accepted Answer

The Kruskal-Wallis test is the appropriate nonparametric test to compare the effectiveness of three programming languages used by the company as it compares more than two independent groups and is robust to highly skewed distributions and extreme outliers. The Wilcoxon signed rank test is used to compare two related samples, the Wilcoxon rank sum test compares two independent samples, the sign test is used to compare paired data with a binary response, and Spearman's rank correlation test is used to examine the correlation between two variables.

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