Is someone who switches brands because of a financial inducement less likely to remain loyal than someone who switches without inducement? Let p1 and p2 denote the true proportions of switchers to a certain brand with and without inducement, respectively, who subsequently make a repeat purchase. Test versus using and the following data:

n 5 600 number of success 5 180 m 5 200 number of success 5 30 a 5 .01 Ha H0: p1 2 p2 5 0 : p1 2 p2 , 0

(Similar data is given in “Impact of Deals and Deal Retraction on Brand Switching,” J. of Marketing, 1980: 62–70.)