Describe how experiment B and experiment C acted as controls for the investigation. [2 marks] Experiment B Experiment C

To describe how Experiment B and Experiment C act as controls in an investigation, it's essential to establish what a control is and why it's crucial in experimental design.

1. Purpose of Controls: Controls are essential for isolating the effect of the independent variable on the dependent variable. They provide a baseline for comparison, helping determine whether the observed effects in the experimental groups are due to the treatment or other factors.

2. Description of Experiments:

   • Experiment B: This experiment likely involves a condition that is unchanged (the control condition), allowing researchers to observe the results in comparison to the experimental groups without the independent variable's influence.
   • Experiment C: Similarly, this experiment may implement a different control condition, but it could also introduce an alternative variable to assess its impact without interference from the primary treatment being tested.

In summary, both experiments serve as control setups by establishing baseline measurements or conditions, allowing the researcher to identify any changes or effects caused by the experimental treatments in the investigation. By comparing results from the experimental group against those in Experiments B and C, researchers can draw valid conclusions regarding the efficacy of the independent variable.