Fifteen pairs of measurements were taken at random to estimate the relation between variables X and Y. A least-squares line was fitted to the collected data. The resulting residual plot is shown. A residual plot is shown with 15 points scattered above and below x axis with no discernible pattern. Which of the following conclusions is appropriate? (3 points) Question 4 options: 1) A line is an appropriate model to describe the relation between X and Y. 2) A line is not an appropriate model to describe the relation between X and Y. 3) The assumption of the Law of Averages has been violated. 4) The variables X and Y are not related at all. 5) There is not enough information about the variables X and Y to form a conclusion.