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Iii answer the following 17 define regression and

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Unformatted text preview: one regression coefficient is greater than unity then the other must be a) greater than unity b) equal to unity c) less than unity d) none of these 3. Regression equation is also named as a) predication equation b) estimating equation c) line of average relationship d) all the above 4. The lines of regression intersect at the point a) (X,Y) b) ( X , Y ) c) (0,0) d) (1,1) 5. If r = 0, the lines of regression are a) coincide b) perpendicular to each other c) parallel to each other d) none of the above 6. Regression coefficient is independent of a) origin b) scale c)both origin and scale d) neither origin nor scale. 7. The geometric mean of the two-regression coefficients byx and bxy is equal to a) r b) r2 c) 1 d) r 8. Given the two lines of regression as 3X – 4Y +8 = 0 and 4X – 3Y = 1, the means of X and Y are a) X = 4, Y = 5 b) X =3, Y = 4 c) X = 2, Y = 2 d) X = 4/3, Y = 5/3 9. If the two lines of regression are X + 2Y – 5 = 0 and 2X + 3Y – 8 = 0, the means of X and Y are a) X = -3, Y = 4 b) X = 2, Y = 4 c) X =1, Y = 2 d) X = -1, Y = 2 10. If byx = -3/2, bxy = -3/2 then the correlation coefficient, r is a) 3/2 b) –3/2 c) 9/4 d) – 9/4 II. Fill in the blanks: 11. The regression analysis measures ________________ between X and Y. 12. The purpose of regression is to study ________ between variables. 13. If one of the regression coefficients is ________ unity, the other must be _______ unity. 238 14. The farther the two regression lines cut each other, the _____ be the degree of correlation. 15. When one regression coefficient is positive, the other would also be _____. 16. The sign of regression coefficient is ____ as that of correlation coefficient. III. Answer the following: 17. Define regression and write down the two regression equations 18. Describe different types of regression. 19. Explain principle of least squares. 20. Explain (i) graphic method, (ii) Algebraic method. 21. What are regression co-efficient? 22. State the properties of regression coef...
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This note was uploaded on 01/18/2014 for the course BUS 100 taught by Professor Moshiri during the Winter '08 term at UC Riverside.

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