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

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

  1. 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.

  2. 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.