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The following table contains the ACT scores and the GPA (grade point average) for eight college students. Grade point average is based on a four-point scale and has been rounded to one digit after the decimal.
Student
GPA
ACT
1
2.8
21
2
3.4
24
3
3.0
26
4
3.5
27
5
3.6
29
6
25
7
2.7
8
3.7
30
(i) Text Box: © Cengage Learning, 2013Estimate the relationship between GPA and ACT using OLS; that is, obtain the intercept and slope estimates in the equation
GPA =5 bˆ 1+ bˆ ACT.0 1Comment on the direction of the relationship. Does the intercept have a useful in- terpretation here? Explain. How much higher is the GPA predicted to be if the ACT score is increased by five points?
(ii) Compute the fitted values and residuals for each observation, and verify that the residuals (approximately) sum to zero.
(iii) What is the predicted value of GPA when ACT 5 20?
(iv) How much of the variation in GPA for these eight students is explained by ACT ? Explain.
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