Rushing for points What is the relationship between rushing yards and points scored in the 2011 National Football League? The table below gives the number of rushing yards and the number of points scored for each of the 16 games played by the 2011 Jacksonville Jaguars.26 Game Rushing yards Points scored 1 163 16 2 112 3 3 128 10 4 104 10 5 96 20 6 133 13 7 132 12 8 84 14 9 141 17 10 108 10 11 105 13 12 129 14 13 116 41 14 116 14 15 113 17 16 190 19

(a) Make a scatterplot with rushing yards as the explanatory variable. Describe what you see.

(b) The number of rushing yards in Game 16 is an outlier in the x direction. What effect do you think this game has on the correlation? On the equation of the leastsquares regression line? Calculate the correlation and equation of the least-squares regression line with and without this game to confirm your answers.

(c) The number of points scored in Game 13 is an outlier in the y direction. What effect do you think this game has on the correlation? On the equation of the least-squares regression line? Calculate the correlation and equation of the least-squares regression line with and without this game to confirm your answers.