Dr.Prutherow believes that people who are under stress will develop more colds than people who are not under stress.When he randomly selected ten participants and exposed them to high levels of stress,he found that nine of the participants developed colds.What critical piece is missing from Dr.Prutherow's study

Question

Quizplus · Accepted Answer

Dr. Prutherow's study lacks a control group that is not exposed to stress. Without a group without stress, it is impossible to determine if the colds were caused by stress or other factors. Establishing a group without stress would allow for comparison and help to determine whether stress has a significant impact on cold development.

DrPrutherow Believes That People Who Are Under Stress Will Develop