A student study of the effects of caffeine asked volunteers to take a memory test 2 hours after drinking soda. Some drank caffeine-free cola, some drank regular cola (with caffeine), and others drank a mixture of the two (getting a half-dose of caffeine). Here are the 5-number summaries for each group's scores (number of items recalled correctly) on the memory test:

a) Describe the W's for these data.
b) Name the variables and classify each as categorical or quantitative.
c) Create side-by-side boxplots to display these results as best you can with this information.
d) Write a few sentences comparing the performances of the three groups.