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Biology, 19.10.2020 14:01 moomoofower
Stress can be measured by the amount of a certain chemical found in saliva. Subjects must be sure to get saliva samples twice a day at least 1 hour after eating or brushing teeth. In a study of 100 subjects, researchers tried to find a correlation between stress levels and the wake up time of the individual. Which factor would NOT be an effective control that experimenters should add to the experiment?
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