For Exercises 2.23 and 2.24, see page 75; and for 2.25 and 2.26, see pages 77–78.

Question 2.31

2.31 Brand-to-brand variation in a product

In Exercise 2.12 (page 73), you examined the relationship between percent alcohol and calories per 12 ounces for 175 domestic brands of beer.

beer

  1. Compute the correlation between these two variables.
  2. Do you think that the correlation you computed gives a good numerical summary of the strength of the relationship between these two variables? Explain your answer.

2.31

(a) . (b) Yes, the relationship between percent alcohol and calories is quite linear, so the correlation gives a good numerical summary of the relationship.