Experiment: Group 1 drinks 500 mL of coffee a day, group 2 drink 500 mL of tea a day, group 3 is a control group. At the end of 60 days all participants' blood pressure is tested. What considerations do the researchers need to take in order to ensure this experiment is fair?
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Experiment: Group 1 drinks 500 mL of coffee a day, group 2 drink 500 mL of tea a day, group 3 is a c...
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