15. The Food and Drug Administration (FDA) reported the number of new drugs approved over an eight-year period (The Wall Street Journal, January 12, 2004). Figure 1.9 provides a bar graph summarizing the number of new drugs approved each year.

a. Are the data qualitative or quantitative?

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

c. How many new drugs were approved in 2003?

d. In what year were the fewest new drugs approved? How many?

e. Comment on the trend in the number of new drugs approved by the FDA over the eight-year period.