For Exercises 2.1 and 2.2, pages 64–65; for 2.3 and 2.4, see page 65; for 2.5 and 2.6, pages 66–67; and for 2.7, see page 68.

Question 2.20

2.20 Use 2003 to predict 2013

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Refer to the previous exercise. The data set also has times for 2003. Use the 2003 times as the explanatory variable and the 2013 times as the response variable.

  1. Answer the questions in the previous exercise for this setting.
  2. Compare the strength of this relationship (between the 2013 times and the 2003 times) with the strength of the relationship in the previous exercise (between the 2013 times and the 2008 times). Interpret this finding.

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