Correlation and Regression

15. In a large introductory sociology course, a professor gives two exams. The professor wants to determine whether the scores students receive on the second exam are correlated with their scores on the first exam. To make the calculations easier, a sample of eight students is selected. Their scores are shown in the accompanying table.

Student Exam 1 Exam 2

1 60 60

2 75 100

3 70 80

4 72 68

5 54 73

6 83 97

7 80 85

8 65 90

Construct a scatter plot of the data, using exam1 score as the X variable. Does the relationship look linear?Assuming a linear relationship exists between c. scores on the two exams; compute the value for Pearson r.How well does the relationship account for the scores on exam 2?