Suppose X1 is a numerical variable and X2 is a dummy variable and the regression equation for a sample of n = 20 is

a. Interpret the regression coefficient associated with variable X1.
b. Interpret the regression coefficient associated with variable X2.
c. Suppose that the tSTAT test statistic for testing the contribution of variable X2 is 3.27. At the 0.05 level of significance, is there evidence that variable X2 makes a significant contribution to the model?

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Y = 6 + 4X + 2X2