Impairer Driving Hypothesis

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When conducting an experiment to test the hypothesis on whether talking on a cell phone impair ones driving abilities, there are various areas of discussion to consider. Why is a control condition important in testing this hypothesis, how should subjects be assigned to conditions, and how can the researchers design the experiment so that the only difference between both conditions is the use of a cell phone?
A controlled condition is anything that can affect the data collected from an experiment that is monitored and kept constant. This is important in testing the hypothesis because if conditions are not kept the same, the conclusions would be incorrect. Conditions of this experiment should be identical for each subject. An unsurpassed way

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