Hall-of-Fame pitcher Bob Gibson of the St. Louis Cardinals was one of the most dominant pitchers during the 1960s. The table shows his age and WHIP (walks + hits per inning pitched) for each year of his career, beginning in 1959. Lower WHIP values are better for pitchers. A) Calculate a quadratic model for these data using age as the explanatory variable.

B) Sketch the scatterplot, along with the quadratic model.

C) Calculate and interpret the residual for his famous 1968 season.