### Home > CC4 > Chapter 3 > Lesson 3.1.1 > Problem 3-12

Mr. Saksunn is concerned both about his students’ scores on the last math test, and about the number of students looking tired in class. He decides to see if there is a relationship between the number of tired or sleepy behaviors (yawns, nodding-off, head on desk) a student exhibits and their test score. He has his assistant observe 10 students and count the number of tired behaviors during one week of class. Homework Help ✎

Tired Behaviors | 2 | 4 | 0 | 2 | 1 | 7 | 0 | 1 | 3 | 6 |

Test Score | 73 | 63 | 89 | 85 | 90 | 58 | 97 | 90 | 79 | 41 |

Make a scatterplot on graph paper and draw the line of best fit. Determine the equation of the line of best fit.

Place the Tired Behaviors on the

*x*-axis and Test Score on the*y*-axis for your scatterplot.The test score is

*y*. The number of tired behaviors is*x*.Using your equation from part (a), predict the test score of a student who exhibits 5 tired behaviors during Professor Saksunn’s math class in a week.

Substituting 5 in for

*x*results in*y*≈ 61.