During the last five years there has been an inflationary trend in the average cost of a gallon of milk, as the following chart shows. Calculate the y-intercept of the regression line. (show your work on another sheet of paper and enter your answer below. Note: you will upload all your calculation work at the end of the test.). X (Years) 2 3 4 5 Y (Dollars) $2.00 $2.50 $3.25 $3.00 $2.80 The y-intercept (a) of the regression line is