A regression was run to determine if there is a relationship between hours of TV watched per day (x) and number of situps a person can do (y). The results of the regression were: y=ax+b a=-0.932 b=39. 678 r2=0.5184 r=-0.72 Use this to predict the number of situps a person who watches 11.5 hours of TV can do (to one decimal place)