Cara 1 :

x̄ = x-bar

Y bar = y bar

r = ∑X_iY_i / (√X_i²) (√Y_i²)

r = sigma xy / (√X2) (√y2)

r = 0

Cara 2 :

∑X = sum x

∑Y = sum y

r = n . ∑XY - (∑X ∑Y) / (√n. ∑X² - (∑X)²)(√n . ∑Y² - (∑Y)²)

r = n(sigmaXY) - (sigma X . sigma Y) / (√ n (sigma X2) - (sigma X)²) (√ n (sigma Y2) - (sigma Y)²)

r = n sigmaXY - sig x Y / (√ sigma X2) (√ sigma Y2)

r = 0