Quantitative Data Analysis Simply Explained Using SPSS ∑ − ̅ − ̅ − ∑ − ̅ ∑ − ̅ √ √ − − √ √ √ √ 2. Regression equation of Y on X. Regression equation is defined as where ∑ ∑ ̅ ̅ b = 0.7447 ̅ ̅ The Theory and Applications of Statistical Inferences 134