Refer to Exercise 6 46 Answer the following questions using the
Refer to Exercise 6.46. Answer the following questions using the combined data for both depths.
a. Use the Wilcoxon rank sum test to assess whether there is a difference in population abundances between the sites within and outside the oil trajectory. Use α = .05.
b. What are the required conditions for the techniques used in part (a)?
c. Are the required conditions satisfied?
d. Discuss any differences in the conclusions obtained using the t procedures and the Wilcoxon rank sum test.
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