Chapter 4 - Section 4.2 - Assess Your Understanding - Vocabulary and Skill Building - Page 215: 7g

$Σresidual^2=0.7907$

Since $ŷ =2.023x−2.324$ $Σresidual^2=Σ(y_i-ŷ _i)^2=Σ[y_i-(2.023x_i-2.324)]^2=Σ(y_i-2.023x_i+2.324)^2$ $Σresidual^2=(4-2.023\times3+2.324)^2+(6-2.023\times4+2.324)^2+(7-2.023\times5+2.324)^2+(12-2.023\times7+2.324)^2+(14-2.023\times8+2.324)^2$ $Σresidual^2=0.7907$