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4. A regression model was developed to test the eect of income on shopping trip -equency. The dependent variable (y) is the number of weekly shopping trips per household. The rst independent variable is household income (x1). Dummy variables are used to indicate whether household location has an effect on this relationship. These binary variables areze' (.1 x2 - This variable is equal to 1 if the household is located in an urban area and 0 otherwise x3 - This variable is equal to 1 if the household is located in a suburban area and 0 otherwise x4 - This variable is equal to 1 if the household is located in a rural area and 0 otherwise.