MCAT Math Question 25: Answer and Explanation
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Question: 25
10. A new study of a weight loss drug uses a radio advertisement to generate study participation. What type of error is most likely to result?
- A. Hawthorne effect
- B. Selection bias
- C. Confounding
- D. Detection bias
Correct Answer: B
Explanation:
Requiring subjects to volunteer for a study and to seek the study out will introduce selection bias. The people who end up volunteering listen to the radio, which the general population may not, and are interested in the topic and willing to volunteer. Most studies suffer from selection bias and it is the most common impediment to generalizability.