4. Continue with Problem 3. (a) How many possible permutations are there for per- muting the groups? (b) Using R., calculate the p-value for R. = 2000 permu- tations. (c) Using R., calculate the p-value for the Krustal-Wallis test-statistic for R = 2000 permutations. (d) Create a boxplot of your data. What test would you suggest, given this plot and the standard devia- tions in 3(d)? A parametric test, a permutation test, the chi-squared approximation to Krustal-Wallis, or a Krustal-Wallis test? Explain