A scientist is hoping to compare the levels of DDT toxin found in three species of fish in a local river. He randomly samples 50 of each species to use in the analysis. For each fish, he measures the
Amount of DDT toxin present. Ideally he will be able to determine if a difference exists in the
Population of DDT toxins found in the three fish species. What type of nonparametric analysis
Should be used?
A) The Wilcoxon Rank Sum Test
B) The Friedman $\mathrm { F } _ { \mathbf { r } }$-Test
C) The Wilcoxon Signed Rank Test
D) The Kruskal-Wallis H-Test
E) The Sign Test

Question

A scientist is hoping to compare the levels of DDT toxin found in three species of fish in a local river. He randomly samples 50 of each species to use in the analysis. For each fish, he measures the
Amount of DDT toxin present. Ideally he will be able to determine if a difference exists in the
Population of DDT toxins found in the three fish species. What type of nonparametric analysis
Should be used? 
A) The Wilcoxon Rank Sum Test
B) The Friedman $\mathrm { F } _ { \mathbf { r } }$-Test
C) The Wilcoxon Signed Rank Test
D) The Kruskal-Wallis H-Test
E) The Sign Test

Quizplus · Accepted Answer

The Kruskal-Wallis H-Test is the correct nonparametric analysis for comparing the levels of a variable (in this case, DDT toxin) across three or more independent groups (the three species of fish). This test does not assume a normal distribution of the data, making it suitable for nonparametric data analysis.

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