Answer based on the following graph, which plots the writing score and the reading score on a certain test.

Answer based on the following graph, which plots the writing score and the reading score on a certain test.

Figure 2: The graph is a scatter plot that shows the writing score and the reading score on a certain test. The horizontal x-axis shows the writing score ranging from 30 to 70 in increments of 10. The vertical y-axis shows the reading score ranging from 30 to 80 in increments of 10. There are around one hundred data points that are spread evenly in concentration along what appears to be a linear trend. The trend shows that as writing score increases, reading score tends to increase as well.

Question: Which of the following is NOT true about the graph?