Circle K runs a contest inviting customers to fill out a registration card. In exchange, they are eligible for a grand-prize drawing of a trip to Alaska. The card asks for the customer's age, education, gender, estimated weekly purchases (in dollars) at the Circle K, and approximate distance the Circle K is from his or her home. Identify each of the following if a multiple regression analysis was to be performed.
a. Independent variable
b. Dependent variable
c. Dummy variable