A)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 slope of the regression line. X (years) 1 2 3 4 5 Y(Dollars) $200 $2.50 $3.25 $3.00 $2.80 B) The y-intercept (a) of the regression line is: C) Using the above data, calculate Pearson's r correlation coefficient