Measures of Spread

Year 10 Interactive Maths - Second Edition

Measures of Spread

A measure of spread tells us how much a data sample is spread out or scattered. We can use the range and the interquartile range (IQR) to measure the spread of a sample. Measures of spread together with measures of location (or central tendency) are important for identifying key features of a sample to better understand the population from which the sample comes from.

Range

The range is a measure of spread and it tells us how much a data set is spread out or scattered.

Range is defined as the difference between the highest and lowest values. That is:

Example 5

Find the range of the following data set:

8 4 13 35 63

Solution:

Key Terms

measures of spread, range

Study Another Topic in Chapter 16: Statistics

[ Statistics ] [ Measures of Spread ] [ Quartiles ] [ Tables ] [ Presenting Data ] [ Scatterplots ] [ Line of Best Fit ] [ Time Series ] [ Symbols ] [ Index ]

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