Which of the following is not a requirement for regression analysis? choose the correct answer below. a. outliers can have a strong effect on the regression equation, so remove any outliers if they are known to be errors. b. visual examination of the scatterplot shows that the points approximate a straight-line pattern. c. the sample of paired (x, y) data is a random sample of quantitative data. d. the method for regression analysis line is not robust. it is seriously affected by a small departure from a normal distribution.