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In order for any experiment to be successful, the experimenter needs to have control over the independent variable. How is this achieved by Heaney et

  • In order for any experiment to be successful, the experimenter needs to have control over the independent variable. How is this achieved by Heaney et al. (2010)? (1 mark)

  • Which group is the control group? (1 mark)

  • The authors say that they used "stratified random allocation". What does that mean? (1 mark)

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