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Also called measures of spread or variation.
Refers to the spread of the values around the central tendency. Indicates how the values disperse or spread around the average,

Measures Of dispersion

1

The simplest measure of dispersion.
Difference between the highest and lowest values,

Range

2

Range formula?

Highest range - lowest range = range

3

It is a measure of the spread of data around their mean.
The positive square root of the variance
Always positive

Standard deviation

4

Bell shaped distribution curve also known as?

Normal or Gaussian distribution

5

A set if values that is the average of squared deviations from the mean.

Variance

6

When using median as centrality measure we can describe variability by providing range or using...?

Semi inter quartile range

7

It is the measure of relative variation
It is independent of units
Used for comparing sets of measurements of different units

Coefficient of variation CV