For Exercises 2.23 and 2.24, see page 75; and for 2.25 and 2.26, see pages 77–78.
2.28 Companies of the world
Refer to the previous exercise and to Exercise 2.11 (page 72). Answer parts (a) and (b) for 2012 and 1992. Compare the correlation you found in the previous exercise with the one you found in this exercise. Why do they differ in this way?
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