Skechers U.S.A., Inc., is a performance footwear company headquartered in Manhattan Beach, California. The sales revenue for Skechers over a four-year period are as follows:

a. Are these cross-sectional or time-series data?

b. Construct a bar graph similar to Figure 1.2 B.

c. What can you say about how Skecher's sales are changing over these four years?

Year 1 .................................. Sales ($ Billion)
Year 1 .................................. 2.30
Year 2 .................................. 3.15
Year 3 .................................. 3.56
Year 4 .................................. 4.16

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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 Feb Mar May Jun Jul Month Aug Sep Nov Dec Sales ($ Millions) Apr Oct