Which part of the following SPSS output represents the "a" in the regression equation Y=bX+a? Coefficients Unstandardized Standardized Coefficients Coefficients Model B Std. Error Beta Sig 1 (Constant) -175.554 12.981 -13.524 .000 yrbm Year of birth .097 007 .362 14.542 000 a. Dependent Variable: eduyrs Years of full-time education completed O 12.981 O -175.554 O .097 O .362