Cola wars is the popular term for the intense competition between Coca-Cola and Pepsi displayed in their marketing campaigns. Their campaigns have featured claims of consumer preference based on taste tests. Recently, the Huffington Post (Nov. 11, 2013) conducted a blind taste test of 9 cola brands that included Coca-Cola and Pepsi. (Pepsi finished 1st and Coke finished 5th.) Suppose, as part of a Pepsi marketing campaign, 1,000 cola consumers are given a blind taste test (i.e., a taste test in which the two brand names are disguised). Each consumer is asked to state a preference for brand A or brand B. 

a. Describe the population. 

b. Describe the variable of interest. 

c. Describe the sample. 

d. Describe the inference.