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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