Basic Statistics 3

1. The measure of Dispersion can never be

2. Which of these is a relative measure of dispersion

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

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

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

6. Variance is always calculated from

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

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

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

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

11. The variance of a constant is

12. The lowest value of variance can be

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

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

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

16. 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

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

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

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

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

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

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

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

24. Variance remains unchanged by the change of

25. A measure of dispersion is always