What is the formula to calculate the Pearson correlation coefficient (r) when N represents the number of paired scores; Σ XY is the sum of the product of the paired X and Y scores; Σ X is the sum of the X scores; Σ Y is the sum of the Y scores; Σ X2 is the sum of the squared X scores; and Σ Y2 is the sum of the squared Y scores?
1) r = (N * Σ XY - Σ X * Σ Y) / √((N * Σ X2 - (Σ X)²) * (N * Σ Y2 - (Σ Y)²))
2) r = (Σ XY - (Σ X * Σ Y) / N) / √((Σ X2 - (Σ X)² / N) * (Σ Y2 - (Σ Y)² / N))
3) r = (N * Σ XY - Σ X * Σ Y) / √((N * Σ X2 - (Σ X)²) * (N * Σ Y2 - (Σ Y)²))
4) r = (Σ XY - (Σ X * Σ Y) / N) / √((Σ X2 - (Σ X)² / N) * (Σ Y2 - (Σ Y)² / N))
