5. Incorrect. The answer is false
Compute `y=5
a. Explained variation=Σ(yest-`y)2= (1.181 - 5)2+(2.453-5)2+ . . .+(9.449-5)2=53.3935
b. Unexplained variation = Σ(y-yest)2=nsy.x2=8*2.5455=2.5455
c. Total variation=Σ(y-`y)2=56