function that returns correlation coefficient .
def correlationCoefficient ( X , Y , n ) : NEW_LINE INDENT sum_X = 0 NEW_LINE sum_Y = 0 NEW_LINE sum_XY = 0 NEW_LINE squareSum_X = 0 NEW_LINE squareSum_Y = 0 NEW_LINE i = 0 NEW_LINE while i < n : NEW_LINE DEDENT