The sum of the squared errors is calculated by which of the following methods? Measure the vertical distance between the actual value of y in a sample and the estimated value of y from the fitted regression line, and then add the squared distances for each observation in the sample. Measure the vertical distance between the actual value of y in a sample and the estimated value of y from the fitted regression line, and then add the distances for each observation in the sample. Measure the vertical distance between the actual value of y in a sample and the estimated value of y from the fitted regression line, and then multiply each term by the correlation coefficient between x and y. Measure the vertical distance between the actual value of y in a sample and the estimated value of y from the fitted regression line