Question: An epidemiologist determined male suicide rates for 20 countries. For example, in 1996, the rate of male suicide in the United States was approximately 19.3 per 100,000 men, while in China that rate was approximately 15.9.

a. What are the variables in this study?

b. Are the variables nominal, ordinal, or scale?

c. What graph would be most appropriate to depict the data? Explain why.

d. If you wanted to track the suicide rates for three of these countries over 50 years, what type of graph might you use to show these data?