Eighteen 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
Which of the following conclusions is appropriate?
The assumption of the Law of Averages has been violated.
The variables X and Y are not related at all.
A line is an appropriate model to describe the relation between X and Y.
A line is not an appropriate model to describe the relation between X and Y.
There is not enough information about the variables X and Y to form a conclusion.
