In an experiment a group of people drink various cups of coffee over a 1 month time span to determine the effect of the coffee intake on each person's heart rate. The experimental group has people that drink 1 cup a day, a group that drinks 2 cups a day and a group that drinks 3 cups a day. Is this a controlled experiment? Why or why not? Your answer
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In an experiment a group of people drink various cups of coffee over a 1 month time span to determin...
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