Scenario: The data table Sleeping Animals contains information about the sizes, life spans, and sleeping habits of various mammal species. The last few columns are ordinal variables classifying the animals according to their comparative risks of being victimized by predators and the degree to which they sleep in the open rather than in enclosed spaces.

a. Create a crosstabulation of predation index by exposure index, and report on what you find.

b. Compare the distribution of hours of sleep across values of the danger index. Report on what you find.

c. Create a scatterplot of total sleep time and life span for these animals. What does the graph tell you?

d. Compute the correlation between total sleep time and life span for these animals. What does the correlation tell you?