A variable is the subject matter for which we want data e.g. volume, abundance etc

  • Independent
  • Dependent
  • Controlled

Types of data:

Categorical/ Qualitative 

  • Nominal- classes that can't be ranked e.g country name, eye colour, presence/absence etc.
  • Ordinal-hierarchies e.g. small-large, excellent-poor, abundant-rare-extinct.

Quantitaive data

  • Interval- measurements scale divided into equal units e.g. degrees celsius- 0=asigned
  • Ratio- has a true zero point e.g. mm, cm etc

To analyse data- we can use tables, graphs or descriptive statistics:

Graphically we…


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