lists data from a study in which 15 lab mice were randomly assigned to one of three groups: group 1 received a standard diet, group 2 received a diet of junk food, and group 3 received an organic diet. The response variable is weight gains

(grams) over a 1-month period.

(a) Outline the design of this study in schematic form. Is this study experimental or nonexperimental?

(b) Explore the data with side-by-side boxplots. Discuss the results of your graphical exploration.

(c) Calculate group means and standard deviations. Relate these summary statistics to your graphical exploration.