For Exercises 14.1 and 14.2, see pages 717–718; for 14.3 and 14.4, see page 720; for 14.5 and 14.6, see page 722; for 14.7, see page 724; for 14.8 and 14.9, see page 726; for 14.10 to 14.13, see pages 728–728; for 14.14 and 14.15, see page 731; for 14.16 to 14.19, see page 739; for 14.20 and 14.21, see page 740; for 14.22 and 14.23, see page 741; for 14.24 and 14.25, see page 742; for 14.26 and 14.27, see page 743; for 14.28 and 14.29, see page 744; and for 14.30 and 14.31, see page 748.

Question 14.6

14.6 Ages of customers at different coffeehouses.

In Example 14.2 (page 712) the ages of customers at different coffeehouses are compared, and you described the ANOVA model for this study in Exercise 14.4 (page 720). Here is a summary of the ages of the customers:

Store
A 38 8 50
B 44 10 50
C 43 11 50
D 35 7 50
E 40 9 50
  1. Is it reasonable to pool the standard deviations for these data? Explain your answer.
  2. For each parameter in your model from Exercise 14.4, give the estimate.