Exhibit 3 Below you are given a regression output based on a sample of 25 observations. Coefficient Standard Error Constant 145.321 48.682 X1 25.625 9.150 X 2 -5.720 3.575 X3 0.823 0.183 Refer to Exhibit 3. The interpretation of the coefficient on X1 is that O a. a one unit change in X, will lead to a 25.625 unit increase in Y when all other variables are held constant O b. a one unit change in X, will lead to a 25.625 unit change in Y O c. a one unit change in X, will lead to a 25.625 unit increase in X2 when all other variables are held constant O d. It is impossible to interpret the coefficient