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Consider a linear regression model where y represents the response variable, x is a quantitative explanatory variable, and dis a dummy variable. The model is estimated as = 14.7 + 4.6x - 3.3d. a. Interpret the dummy variable coefficient. Intercept shifts down by 3.3 units as d changes from 0 to 1. Slope shifts down by 3.3 units as d changes from 0 to 1. Intercept shifts up by 3.3 units as d changes from 0 to 1. Slope shifts up by 3.3 units as d changes from 0 to 1. b. Compute for x = 2 and d= 1. (Round your answer to 1 decimal place.) c. Compute for x = 2 and d = 0. (Round your answer to 1 decimal place.)