Question: Breakstone Company makes whipped butter and whipped margarine. A company market analyst wanted to test whether people prefer the taste of one of these products over the other. A random sample of consumers was selected, and each one was asked to taste both the butter and the margarine and then to state a preference. The data follow. Is there evidence that one of the two products is preferred over the other? (M denotes margarine and B is for butter.)

M B B B M B B M B B B B M M B M M M B B M B B B B (no pref.) M B B B B (no pref.) M M M B M B B B B B M B