The data from Exercise 16.66 on weight losses, in kilograms, over a 1-year period of four popular diets. Recall that negative losses are gains and that WW = Weight Watchers.
In Exercises 16.158-16.166, use the technology of your choice to do the following tasks.
a. Decide whether conducting a Kruskal-Wallis test on the data is reasonable. If so, also do parts (b)-(d).
b. Use a Kruskal-Wallis test to decide, at the 5% significance level, whether the data provide sufficient evidence to conclude that a difference exists among the means of the populations from which the samples were taken.
c. Interpret your results from part (b).
d. If a one-way ANOVA test was performed on the data in Section 16.3, compare your results there to those obtained here.
All data sets are on the WeissStats site.