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A study observes that individuals who regularly attend the gym have a lower incidence of a specific chronic illness compared to those who do not. However, it's possible that people who choose to go to the gym are also more likely to have healthier diets, and this dietary difference could be the real reason for their better health outcomes. In this analysis, the 'healthier diet' is an example of a(n) ___________ variable, making it difficult to determine the true health benefit of gym attendance alone.
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A study observes that individuals who regularly attend the gym have a lower incidence of a specific chronic illness compared to those who do not. However, it's possible that people who choose to go to the gym are also more likely to have healthier diets, and this dietary difference could be the real reason for their better health outcomes. In this analysis, the 'healthier diet' is an example of a(n) ___________ variable, making it difficult to determine the true health benefit of gym attendance alone.
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