The independent variable will be the choice of colour. The participant's favourite colour will be the cause of the experiment, as results will be formed due to which coloured M&Ms they will pick.
The dependent variable is the value that depends on the independent variable. It is the effect of the experiment and this is the results of the experiment.
The dependent variable is the chosen M&Ms by the participants as it is the effect of the participant's favourite colour. It is dependent on the independent variable (choice of colour) and therefore may change due to participant's different colour preferences.
Controlled variables are variables which are kept the same/constant in order to show the relationship between the independent and dependent variable.
The controlled variable in the experiment was the number of M&Ms of each colour in the bowl which the participants took from. I also kept the age group and gender the same so that all participants were as equal as possible to ensure more accuracy in results.
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