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Different types of variables

In the last chapter, we explored the structure of an experiment or investigation in terms of variables. Variables (whether they are independent, dependent or control) come in different guises. Identifying the type of variable in a scientific report, such as in the headlines above, helps to determine how the data should be analysed and how the question can be answered. So the type of variable matters. The types of variables we need to consider here are: categoric ordered continuous. Any and every variable has associated with it certain ‘values’. In our kettle example the variable ‘the type of material’ has values which are names such as plastic, steel or copper. Similarly ‘the shape of the kettle’ has values such as round or jug-shaped. These are the values of the variables ‘the type of material’ or ‘the shape of the kettle’. They are values which cannot be measured by numbers; Like ...

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