Friday

April 18, 2014

April 18, 2014

Posted by **Casey** on Thursday, November 7, 2013 at 11:06pm.

The computer-science aptitude score, x, and the achievement score, y (measured by a comprehensive final), were measured for 10 students in a beginning computer-science course. The results were as follows. (Give your answers correct to two decimal places.)

x 22 11 7 18 14 8 22 9 9 6

y 15 24 28 28 33 27 21 30 19 15

(a) Find the equation of the line of best fit.

Y = 26.24 + -.18 x

(b) Find se2.

- Statistics -
**Kuai**, Friday, November 8, 2013 at 12:01amse2 = sqrt (SSE/n-2))

e = y-yhat

e = 26.24-.18(22) =22.28

x. y. y hat e e^2

22. 15. 22.28. -7.28. 52.9984

11. 24. 24.26 -.26. 0.0676

7. 28. 24.98. 30.2. 9.1204

18. 28. 23. 5. 25

14. 33. 23.72. 9.28. 86.1184

8. 27. 24.8. 2.2. 4.84

22. 21. 22.28 -1.28. 1.6384

9. 30. 24.62. 5.38. 28.9444

9. 19. 24.62. -5.62. 31.5844

6. 15. 25.16. -10.16. 103.226

Sum of e^2 = 343.578

se = sqrt(343.578/8))

se = 6.55342

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