Below you are given a partial computer output from a multiple regression analysis based on a sample of 16 observations. Coefficients Standard Error 12.924 Constant 4.425 -3.682 2.630 X1 45.216 12.560 Analysis of Variance Source of Variation Degrees of Freedom Sum of Squares Mean Square 4853 2426.5 Regression 485.3 Error The interpretation of the coefficient of x1 is that a. a one unit change in x1 will lead to a 3.682 unit decrease in y. b. a one unit increase in x1 will lead to a 3.682 unit decrease in x2 when all other variables are held constant. c. a one unit increase in x1 will lead to a 3.682 unit decrease in y when all other variables are held constant. d. The unit of measurement for y is required to interpret the coefficient