1. Which of the following is/are not correct ?

1. A relation such as  and  is not possible
2. Spearman’s rank correlation is distribution free or non-parametric
3. If one of the regression coefficients are greater than unity, the other must also be greater than unity
4. Arithmetic mean of regression coefficients is always zero

2. Which of the following is correct ?

3. Which of the following is correct ?

4. Which of the following is true ?

5. If by x = -2 and bxy = –  then rxy is

6. If regression equations are 8x – 10 = 64 and 40x – 18y = 320, then what are the mean values of x and y ?

7. If two regression coefficients are 0.8 and 0.6, what would be the value of the coefficient of correlation ?

8. Given the regression equation of y on x and x on y are respectively y = 2x and 6x – y = y. What is the value of correlation coefficient?

9. Which of the following is correct statement ?

10. If A is the set of all integral multiples of 3 and B is the set of all integral multiples of 5, then A ⋂ B is the set of all integral multiples of-