Which of the following statements about the linear least squares model is FALSE? a) The population correlation R can measure both the direction and the strength of the linear association between two quantitative variables. b) When we construct the confidence interval for the population slope B. we should always check if our sample is random c) The point (X.) must lie on the regression line, where x is the sample mean of the explanatory variable and V is the sample mean of the response variable. d) If all points fall exactly on a straight line, then the sample correlation r must be 1.