Summary Numbers

Summary Statistics

When you have a collection of numbers how can you describe what type of numbers you have ?
Is there a way of describing this data in a concise and accurate way?
The answer is yes, we can use Summary Statistics
Exactly which type of summary statistics we use will depend on the type of data that we are trying to describe.

Types of Summary Statistics

When our data is related to a single quantity there are two main types of summary statistics
1) Measures of Location (Link - distributions/central-tendency) - what is the size of the numbers
2) Measures of Spread (or dispersion) (Link - distributions/dispersion) - how much do the numbers vary
Data that is concerned with a single quantity is called "univariate data"

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