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LU4: Measures of Dispersion - Coggle Diagram
LU4: Measures of Dispersion
Ungrouped data
Mean Deviation (M.D)
Variance
MD - Absolute value
Variance - Square it
Population variance
Formula 1
Formula 2
sample variance
Formula 1
Formula 2
Range
Range= Highest value - lowest values
Standard Deviation (S.D)
Grouped data
Range
Difference between highest and lowest values
Standard Deviation
Fluctuation of Data
Types of values
Bigger values of dispersion
the data is dispersed
Mean may not be reliable
Mean is not representative of the data
Small values of dispersion
the data is clustered closely together
The mean could be quite representative of the data
Spread of Data
