For Exercises 15.1 to 15.3, see pages 15-6 to 15-7; for 15.4 to 15.6, see page 15-10; for 15.7, see pages 15-12 to 15-13; for 15.8 to 15.10, see page 15-15; for 15.11, see page 15-16; for 15.12 and 15.13, see page 15-18; and for 15.14 to 15.16, see pages 15-20 to 15-21.
15.11 Plot the data for Case 15.2.
CASE 15.2 Make a plot similar to the one given in Figure 15.5 for the levels of the factors given in Case 15.2. Connect the means with lines. Do the conditions for ANOVA inference appear to be met? Describe the pattern of the group means.
15.1
The d30-p1 group seems more spread out than the other 3 groups; also, the d10-p5 group has a low outlier. These concerns likely violate the conditions for ANOVA. The mean prices do seem different for the different promotion and discount combinations.
freq2