Basic Statistics 3

1. If $X$ and $Y$ are independent then $SD(X-Y)$ is

2. A measure of dispersion is always

3. Variance remains unchanged by the change of

4. The percentage of values lies between $\overline{X}\pm 2 SD\,$ is

5. The variance of 5 numbers is 10. If each number is divided by 2, then the variance of new numbers is

6. The sum of squared deviations of a set of $n$ values from their mean is

7. The range of the values -5, -8, -10, 0, 6, 10 is

8. Which of these is a relative measure of dispersion

9. The measure of dispersion is changed by a change of

10. The standard deviation is always _________ than the mean deviation

11. The sum of squares of deviation is least if measure from

12. Suppose for 40 observations, the variance is 50. If all the observations are increased by 20, the variance of these increased observations will be

13. The lowest value of variance can be

14. For the symmetrical distribution, approximately 68% of the cases are included between

15. The mean deviation of the values, 18, 12, 15 is

16. If $Y=-8X-5$ and SD of $X$ is 3, then SD of $Y$ is

17. If all values are same then the measure of dispersion will be

18. If $a$ and $b$ are two constants, then $Var(a + bX)\,$ is

19. $Var(2X+3)\,$ is

20. The measure of Dispersion can never be

21. Variance is always calculated from

22. Standard deviation is calculated from the Harmonic Mean (HM)

23. The variance of a constant is

24. Mean Deviation, Variance and Standard Deviation of the values 4, 4, 4, 4, 4, 4 is

25. If the standard deviation of the values 2, 4, 6, 8 is 2.58, then the standard deviation of the values 4, 6, 8, 10 is