Part B
INDIAN ECONOMIC DEVELOPMENT

According to Spiegel dispersion is the degree to which numerical data tend so spread about an average value is called the variation. Features are (i) Rigidly Defined; (ii) Simple Interpretation; (iii) Easy to Calculate; (iv) Based on all values20180213 14:15:48

Absolute Measures of Dispersion is the dispersion of the series is expressed in s of the original unit of series.Relative Measures of Dispersion is the relative measures of dispersion express the variability in terms of some relative value or percentage

Range is the difference between the largest and smallest value of distribution. Range = Largest (L)  Smallest (S)20180213 14:14:18

Merits of Range are (i) Simple to Understand; (ii) Widely Used in Statistical Quality Control.Demerits of Range are (i) Affected by Extreme Values; (ii) Can't be calculated in open end series

Quartile Deviation is the half of inter quartile range Q.D. = (Q3  Q1) / 2.Inter Quartile Range is the difference between Upper Quartile (Q3) Lower Quartile (Q1).
Symbolically represented as I
nterQuartile Range = Q3 – Q1 
Mean Deviation is defined as the arithmetic average of the absolute deviationFeatures are (i) Rigidly Defined; (ii) Depends on all values of the variable; (iii) Based on Absolute deviations (iv) Easy to Understand; (v) Involves harder calculations than the range and quartile deviation

Standard Deviation is defined as the square root of the arithmetic mean of the squares of deviations of the items from their mean value.Features are (i) Not very much affected by fluctuation of sampling; (ii) Only measure for calculating combined standard deviation of two or more; (iii) Definite measure of dispersion

List of Formulae of Dispersion are:Coefficient of Range = (L – S) / (L + S)Coefficient of Quartile Deviation = (Q3 – Q1) / Q3 + Q1Coefficient of M.D. = M.D / Mean or MedianCoefficient of Standard Deviation (a) = a/XCoefficient of Variation = a / X * 100"
