The Dow Jones company calculates a number of stock market index numbers that are used as indicators of the performance of the New York Stock Exchange. The best known of these is the Dow Jones Industrial Average (DJIA), which is calculated based on the performance of 30 stocks from companies categorized as general industry. Observations for each of the 30 companies in the DJIA are shown in Table 2.6.7.
a. What is an elementary unit for this data set?
b. What kind of a data set is this: univariate, bivariate, or multivariate?
c. Which of these variables are quantitative? Which are qualitative?
d. If there are any qualitative variables in this data set, are they nominal or ordinal?
e. Is this cross-sectional or time-series data?

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TABLE 2.6.7 Closing Price and Monthly Percent Change for the Companies in the DJIA Closing Price February 1, 2002 Percent Change from January 2, 2002 Closing Price February 1, 2002 Percent Change from January 2, 2002 Company Name 3M Alcoa American Express AT&T Boeing Caterpillar Citigroup Coca-Cola DuPont Eastman Kodak Exxon Mobil General Electric General Motors Hewlett-Packard Home Depot 113.27 35.15 35.10 17.33 41.46 50.52 46.49 44.68 43.58 28.25 39.00 36.85 51.11 22.00 49.40 Company Name Honeywell IBM Intel Corp International Paper J. P. Morgan Chase& Co. Johnson & Johnson McDonald's Merck Microsoft Corp. Philip Morris Procter & Gamble SBC Communications United Technologies Wal-Mart Stores Walt Disney -3.30% 33.68 108.00 34.67 41.77 32.16 57.60 26.63 59.43 62.66 49.73 82.57 39.96 70.05 59.26 22.45 0.84% 5.06 4.03 -11.53 7.33 8.82 2.19 -8.86 -5.88 1.54 -3.62 0.53 -0.55 -6.53 6.63 3.21 0.15 8.87 2.08 4.66 -10.01 5.08 1.62 1.96