The accompanying table shows a portion of the 30 companies that comprise the Dow Jones Industrial Average

The accompanying table shows a portion of the 30 companies that comprise the Dow Jones Industrial Average (DJIA); the full data set can be found on the text website and is labeled DOW_Characteristics. The second column shows the year that the company joined the DJIA (Year). The third column shows each company’s Morningstar rating (Rating). (Five stars is the best rating that a company can receive, indicating that the company’s stock price is undervalued and thus a very good buy. One star is the worst rating a company can be given, implying that the stock price is overvalued and a bad buy.) Finally, the fourth column shows each company’s stock price as of June 30, 2010 (Stock Price).

a. What is the measurement scale of the Year data? What are the strengths of this type of data? What are the weaknesses?
b. What is the measurement scale of Morningstar’s star-based rating system? Summarize Morningstar’s star-based rating system for the companies in tabular form. Let 5 denote, 4 denote, and so on. What information can be extracted from these data?
c. What is the measurement scale of the Stock Price data? What are itsstrengths?

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Company 3M (MMM) Alcoa (AA) RatingStock Price Year 1976 1959 $78.99 10.03 koicik Walt Disney (DIS) 1991 31.50 et-k