Table 10.17 shows subjects’ purchase choice of instant decaffeinated coffee at two times. a. Fit the symmetry model and use residuals to analyze changes. b. Test marginal homogeneity. Show that the...

Table 10.17 shows subjects’ purchase choice of instant decaffeinated coffee at two times.

a.Fit the symmetry model and use residuals to analyze changes.

b.Test marginal homogeneity. Show that the smallP-value reflects a decrease in the proportion choosing High Point and an increase in the proportion choosing Sanka, with no evidence of change for the other coffees.

c.Show that quasi-independence hasG
²=13.8(df=11). Interpret, and suggest other analyses that might be useful.

TABLE 10.17 Data for Problem