In order to establish a cause-and-effect relationship between regular exercise and improved cognitive functioning in older adults, a researcher would need to do which of the following?
Randomly assign a group of adults over the age of 55 to either an exercise or an alternative sedentary activity, and administer a cognitive assessment at the beginning of the study and again after three months.
This approach allows for the establishment of a cause-and-effect relationship by controlling variables and comparing the cognitive outcomes of those engaged in exercise versus those in a sedentary group, thereby isolating the effect of exercise on cognitive functioning.
Surveys provide correlational data rather than causal evidence, as they cannot account for confounding variables that may influence cognitive functioning. Thus, while the survey might show a relationship, it does not confirm that exercise directly improves cognitive abilities.
This method also relies on observational data and does not manipulate any variables, making it difficult to establish causality. Differences observed might be influenced by other environmental factors present in the communities rather than exercise alone.
This choice is the most effective for determining causality, as random assignment minimizes biases and confounding variables. By comparing baseline and follow-up assessments, the researcher can directly measure the impact of exercise on cognitive performance.
Case studies focus on individual experiences and cannot be generalized to a larger population. This method lacks the systematic approach needed to draw conclusions about the broader relationship between exercise and cognitive functioning.
Similar to other observational methods, this approach does not manipulate variables or control for outside influences, making it difficult to ascertain whether exercise directly influences cognitive abilities or if other factors are at play.
Establishing a cause-and-effect relationship between regular exercise and improved cognitive functioning requires a controlled experimental design, specifically one that utilizes random assignment. This ensures that the observed outcomes can be attributed to the intervention—in this case, exercise—rather than other confounding factors. While other options provide valuable insights, they do not meet the rigorous standards necessary for causal inference.
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