Q.1DEFINE DISPERSION. WHAT ARE THE TWO MAIN TYPES OF MEASURES OF
DISPERSION? 

(A) DISPERSION 

(B) FOLLOWING ARE THE TWO MAIN TYPES OF MEASURES OF DISPERSION:  
(1) ABSOLUTE MEASURES 

(2) RELATIVE MEASURES 

Q.2WHAT ARE THE OBJECTIVES OF COMPUTING DISPERSION?
OR WHAT IS THE NEED OF COMPUTING DISPERSION? 

ANSWER:  
(1) COMPARATIVE STUDY 

(2) RELIABILITY OF AN AVERAGE 

(3) CONTROL THE VARIABILITY 

(4) BASIS FOR FURTHER STATISTICAL ANALYSIS 

Q.3LIST CHARACTERISTICS OF A GOOD MEASURE OF DISPERSION.  
ANSWER:  
CHARACTERISTICS OF A GOOD MEASURE OF DISPERSION 

Q.4WHAT ARE THE VARIOUS â€˜ABSOLUTE MEASURESâ€™ OF DISPERSION?  
ANSWER:
FOLLOWING ARE THE DIFFERENT â€˜ABSOLUTE MEASURESâ€™ OF DISPERSION: 

(1) RANGE 

(2) INTERQUARTILE RANGE 
Interquartile Range = Upper Quartile (Q_{3})â€“Lower Quartile(Q_{1}) 
(3) QUARTILE DEVIATION 

(4) MEAN DEVIATION 

(5) STANDARD DEVIATION 

(6) LORENZ CURVE 

Q.5WHAT ARE THE VARIOUS â€˜RELATIVE MEASURESâ€™ OF DISPERSION?  
ANSWER:
FOLLOWING ARE THE RELATIVE MEASURE OF DISPERSION: 

(1) COEFFICIENT OF RANGE  It refers to the ratio of the difference between two extreme items of the distribution to their sum.
Coefficient of Range_{ \(\frac{Largest\, Item\left ( _{L} \right )\, \,Smallest\, Item\left ( _{S} \right )}{Largest\, Item\left ( _{L} \right )\, \,Smallest\, Item\left ( _{S} \right )}\)} 
(2) COEFFICIENT OF QUARTILE DEVIATION  It refers to the ratio of the difference between Upper Quartile and Lower Quartile of a distribution to their sum.
Coefficient of Quartile Deviation = _{\(\frac{_{Q3}\, \, _{Q1}}{_{Q3}\, +\, {Q1}}\)} 
(3) COEFFICIENT OF MEAN DEVIATION 

(4) COEFFICIENT OF STANDARD DEVIATION 

(5) COEFFICIENT OF VARIATION 
_{\(\bar{X}\)} = Arithmetic Mean 
Q.6WHAT ARE THE MERITS AND DEMERITS OF RANGE?  
ANSWER:  
MERITS 

DEMERITS 

Q.7WHAT ARE THE MERITS AND DEMERITS OF QUARTILE DEVIATION?  
ANSWER:  
MERITS 

DEMERITS 

Q.8WHAT ARE THE MERITS AND DEMERITS OF MEAN DEVIATION?  
ANSWER:  
MERITS 

DEMERITS 
