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PHAN L. CAC CAU HOI TRAC NGHIEM @ diém) C4u 1: Sir dung dé liéu thu thdp tir 100 nhan vién dé ude tinh méi quan hé gitta thu nh4p (X, trigu déng) = By + BX + &. Taco két va chi tiéu (Y, triéu déng) hang thang bang m6 hinh hdi quy don bien ¥; qua héi quy nhu sau: ? = 5.5 + 0.7 X. Tim khoang dir bao voi d6 tin cay 95% cho chi tiéutrung binh ctia m6t ngudi cé thu nhap 15 trigu déng / thang. Cho biét, tai Xy = 15 thi se(Y%) = 0.57, va to.o25(98) = 1.98 A. (15.43, 16.57) 4.87, 1713) C. (14.02, 17.98) D. (14.50, 17.50) C4u 2: Két qua hdi quy gitra Tién hrong (wage) phy thudc vao trinh d@ hoc van (educ) thé hién trong bang sau: Source Ss df MS Number of obs = 526 F(1, 524) = 103.36 Model 1179.73204 | 1 1179.73204_ | Prob >F = 0.0000 Residual | 5980.68225 | 524 11.4135158_| R-squared = 0.1648 Adj R-squared = 0.1632 Total 7160.41429 | 525 13.6388844 | Root MSE = 3.3784 wage Coefficient | Std.err [| t Pot [95% conf. interval] educ 0.541 0.053 10.17 0.000 0.437 0.646 cons -0.905 0.685 -1.32 0.187 2.250 0.441 Dém sé phat bigsu DUNG i. edue giai thich duoc 16.48% su thay déi cua wage ii, Bién edue c6 ¥ nghia 6 mire ¥ nghia 1%. iii. Mé hinh dé xuat pha hop véi mite y nghia 5%. AO Bl C2 Bi: Cau 3: Xét m6 hinh hi quy Y = By + BX, + BrX2 + €. Dua trén 50 quan sat, ta tim duoc hé s6 xac dinh R? = 0.8526. Xac dinh gia tri cia thong ké F va kiém dinh su phi hop cta mé hinh 6 mic y nghia 5%, Cho biét gid tri tra bang Fisher la F, 95.4, = 3.195 A. F = 138.82, mé hinh khéng phu hop B. F = 138.82, m6 hinh phu hop C. F = 135.93, mé hinh khéng phir hop BF = 135.93, mé hinh phi hop 
