A Scientist Is Hoping to Compare the Levels of DDT $\text { The Friedman } \mathrm { F } _ { \mathrm { r } } \text {-Test }$

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 Sign Test
B) The Wilcoxon Rank Sum Test
C) The Wilcoxon Signed Rank Test
D) The Kruskal-Wallis H-Test
E) $\text { The Friedman } \mathrm { F } _ { \mathrm { r } } \text {-Test }$