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?

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.
The assumption of the Law of Averages has been violated.
The variables X and Y are not related at all.
There is not enough information about the variables X and Y to form a conclusion.