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Measures of Dispersion
What are the uses of coefficient of variation?
Coefficient of variation is used to compare the variability, homogeneity, stability and uniformity of two different statistical series. Higher value of coefficient variation suggests greater degree of variation and lesser degree of stability. On the other hand, a lower value of coefficient variation suggests lower degree of variability and higher degree of stability, uniformity, homogeneity and consistency.
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The sum of 10 values is 100 and the sum of their squares is 1090. Find the coefficient of variation.
Calculate the mean deviation about mean and standard deviation for the following distribution:
|
Classes |
Frequencies |
|
20–40 |
3 |
|
40–80 |
6 |
|
80–100 |
20 |
|
100–120 |
12 |
|
120–140 |
9 |
|
50 |
A measure of dispersion is a good .supplement to the central value in understanding a frequency distribution. Comment
Define dispersion.
How many methods are there to calculate dipersion?
Define range.
Define quartile deviation.
How is coefficient of quartile deviation calculated?
Define mean deviation.
Define standard deviation.
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