The U.S. Census Bureau tracks sales per month for various products and services through its Monthly Retail Trade Survey. Figure 1.9 shows monthly jewelry sales in millions of dollars for 2016. 

a. Are the data quantitative or categorical? 

b. Are the data cross-sectional or time series? 

c. Which four months have the highest sales? 

d. Why do you think the answers to part c might be the highest four months? 

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FIGURE 1.9 Estimated Monthly Jewelry Sales in the United States for 2016 7000 6000 5000 4000 3000 2000 1000 Jan May Jun Jul Aug Month Sep Oct Nov Dec Sales ($ Millions) Feb Mar Apr AON