Dispersion

Question 1

Range

Coefficient of Range

Answer 1

L-S

L-S/L+S x 100

Question 2

Range of Y

Answer 2

|b| x Range of x

Question 3

MD of A

Answer 3

1/n E |x-A|

Question 4

MD of A

Answer 4

1/n E |x-A|f

Question 5

Coefficient of MD

Answer 5

Mean Deviation about A / A x 100

Question 6

MD of y

Answer 6

|b| x MD of x

Question 7

MD about median

Answer 7

E |X -median| / n

Question 8

Coefficient of Mean deviation

Answer 8

MD about median / median x 100

Question 9

S.D discrete

Answer 9

square root (E(xi - /x)2 /n )

Question 10

S.D Grouped Frequency

Answer 10

square root (Ef (xi - /x)2 /n )

Question 11

Variance = s^2

Answer 11

square root (E(xi - /x)2 /n ) [Unclassified data]

square root (Ef (xi - /x)2 /n ) [grouped frequency]

Question 12

Coefficient of Variation (CV)

Answer 12

SD/AM x 100

Question 13

SD of first n natural numbers is SD

Answer 13

Square root ( n^2 -1) / 12

Question 14

If all the variable of X is k is equal

Answer 14

SD = 0

Question 15

Standard Deviation remains unaffected due

Answer 15

to Change of origin but it is affected in the same ratio due to a change in scale.

Sy = |b| Sx

Question 16

Combined SD

Answer 16

Square root (n1s1^2 + n2s2^2 + n1d1^2 + n2d2^2) / n1+n2

Question 17

QD

Answer 17

Q3 - Q1/2

Question 18

Coefficient of QD

Answer 18

Q3 - Q1 / Q3+Q1 x 100

Question 19

Absolute measure of deviation

Answer 19

Range
SD
Mean Deviation
Quartile deviation

Question 20

Relative Measure of Deviation

Answer 20

Coefficient of Range
Coefficient of Variation
Coefficient of mean deviation
Coefficient of Quartile deviation

Question 21

For comparing two or more distributions,

Answer 21

Relative measure are considered and not absolute measure are considered

Question 22

Why Range is not regarded as Ideal measure of Dispersion ?

Answer 22

Since it is based on only two observations