Dr.Prutherow believes that people who are under stress will develop more colds than people who are not under stress.When he randomly selects 10 participants and exposes them to high levels of stress,he finds that 9 of the participants develop colds.Based on these results he concludes that stress causes an increase in colds.Dr.Prutherow's reasoning may be flawed because in this study

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Dr. Prutherow did not have a control group of participants who were not exposed to stress, so he cannot be sure that the increase in colds was due to the stress and not some other variable. Therefore, his conclusion that stress causes an increase in colds may be flawed.

DrPrutherow Believes That People Who Are Under Stress Will Develop