Advanced Placement (AP), 26.09.2019 22:30 gujaratif932
You read a blog post that claims vitamin d could prevent people from catching a cold. you ask for volunteers at work to you test this statement. one hundred people volunteer to take 1000 iu of vitamin d per day for 180 days and track the number of colds they get during that time. these people make up group 1. one hundred other people volunteer to not take any vitamin d for 180 days, but to still track the number of colds they get during that time. these people make up group 2. you do not ask any of the volunteers any questions about their health or what they do outside of work. the experiment runs the same length of time for both groups, and everyone starts on the same day. what variables would you need to control in order to make the experiment reliable?
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