Sheera drew the line below to show the trend in the data. Assuming the line is correct, what does the line slope of 15 mean? So let's see. The horizontal axis is time studying in hours. Vertical axis is scores on the test. And each of these blue dots represent the time and the score for a given student. So this student right over here spent, I don't know, it looks like they spent about.6 hours studying, and they didn't do too well on the exam.