Suppose you think that there are diminishing returns to studying. Test this hypothesis by opening up the file survey data.xls and creating a new variable Hours study squared. Regress GPA on Hours...

Extracted text: Suppose you think that there are diminishing returns to studying. Test this hypothesis by opening up the file survey data.xls and creating a new variable Hours study squared. Regress GPA on Hours studied and Hours studied squared. Explain how Hours studied affects GPA, and comment on the statistical significance of the indepen- dent variables at the 5 percent level. Where does Hours studied reach a maximum? Now estimate a more fully specified model by regressing GPA on Hours studied Hours studied squared, Work, Video game, Texts, and Male. Interpret the marginal effect of Hours studied, and comment on the statistical significance of all of the independent variables at the 5 percent level.


Extracted text: id GPA Hours Studied Work Video Games Тexts Male 36 2.90 3 20 50 37 2.57 6 6 3 1000 1 38 1.96 3 30 10 1200 39 2.43 5 10 5 850 40 3.27 8. 200 41 2.89 100 42 3.29 10 15 2 300 43 2.90 20 250 44 2.99 7 20 4 100 45 2.33 3 20 14 1100 1 46 3.82 18 50 47 3.40 8 20 200 1 48 2.28 20 18 950 1 49 3.68 8 5 3 250 1 50 2.92 3.5 10 200 51 3.31 7 10 4 50 52 3.98 30 50 53 3.82 40 5 2 100 54 2.85 7 10 500 55 2.95 6 20 100 1 56 3.78 12 10 50 1 57 2.63 40 5 700 1 58 2.63 6.5 10 600 1 59 3.18 10 5 500 1 60 3.45 14 10 3 100 61 3.58 9 100 62 2.84 4 20 600 1 63 2.70 4.5 20 6 800 64 2.93 8 10 50 1 65 3.29 9 100 66 2.95 4.5 200 67 3.13 6. 10 50 1 68 2.54 3.5 900 69 2.88 9. 10 550 70 2.41 4.5 15 10 1000 1