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Measures of Dispersion : Range , Quartile Deviation, Standard Deviation and Variance.

Measures of Dispersion :  I.  Introduction. II. Requirements of good measures. III. Uses of Measures of Dispersion. IV.  Methods Of Studying Dispersion:     i.  Absolute Measures of Dispersions :             i. Range (R)          ii. Quartile Deviation (Q.D.)          iii. Mean Deviation (M.D.)         iv. Standard Deviation (S. D.)         v. Variance    ii.   Relative Measures of Dispersions :              i. Coefficient of Range          ii. Coefficient of Quartile Deviation (Q.D.)          iii. Coefficient of Mean Deviation (M.D.)         iv. Coefficient of Standard Deviation (S. D.)         v. Coefficient of Variation (C.V.)                                                                                                                    I.  Introduction. We have the various measures of central tendency, like Mean, Median & Mode,  it is a single figure that represent the whole data. Now we are interested to study this figure(i.e. measures of central tendency) is proper represe