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wrote...
Posts: 221
2 weeks ago
Earning power A college's job placement office collected data about students' GPAs and the salaries they earned in their first jobs after graduation. The mean GPA was 2.9 with a standard deviation of 0.4. Starting salaries had a mean of $47,200 with a SD of $8500. The correlation between the two variables was r = 0.72.  The association appeared to be linear in the scatterplot. (Show work.)

a. Write an equation of the model that can predict salary based on GPA.
b. Do you think these predictions will be reliable? Explain.
c. Your brother just graduated from that college with a GPA of 3.30. He tells you that based on this model the residual for his pay is -$1880. What salary is he earning?
Textbook 

Stats: Modeling the World


Edition: 4th
Authors:
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wrote...
Posts: 246
2 weeks ago
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a. = 2830 +15300gpa
b. Somewhat reliable; based on this model, differences in GPA explain only 52% of the variability
    in salaries.
c. $51,440
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