Reason why experiments should be repeated, to improve the reliability of the results, Purpose of a control, to show that the change in the dependent variable is due to the factor being investigated, the variable that is changed, independent variable, the variable that is measured, dependent variable, variables that are controlled, controlled variables, reason why some variables must be controlled, to ensure the validity of the results, how to write an aim, To investigate the effect of (insert independent variable here) on (insert dependent variable here), Alternative reason why experiments should be repeated, to reduce the effect of anomalous results.

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