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# Statistics

### Maths

TermDefinition
Primary data Is data collected by an individual or organisation for their own use
Secondary data this is already available or has been collected by somebody else for a different purpose
Ordinal categorical data Can be ordered in some way
Nominal categorical data Cannot be ordered
The population is the entire group that is being studied
A sample is a group that is selected from the population
A questionnaire is a set of questions designed to obtain data from the population
A stem and leaf plot represents numerical data by seperating each piece of data into two parts: the stem and the leaf
The mode a set values is the value that occurs most often
The median of a data set is the middle value after the data has been ranked
An outlier is an observation that lies an abnormal distance from other values in a data set
Created by: Sarah C. Lynch
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