MCAT® ExamCritical Analysis and Reasoning SkillsEasy
A medical student is analyzing a research paper that concludes a new drug significantly reduces symptom severity. However, the study only included participants from a single, highly specialized clinic, all of whom shared a very similar demographic profile. Which of the following concepts best describes a potential limitation of this study's findings?
- AStatistical Validity
- BConstruct Validity
- CInternal Validity
- DExternal Validity
Show answer & explanationAnswer & explanation
Correct answer: D. External Validity
External validity refers to the extent to which the results of a study can be generalized to other situations and to other people. A study with a narrow demographic and single clinic may not generalize well.
Why the other options are wrong
- A. Statistical validity refers to whether a study's statistical conclusions are accurate and reasonable.
- B. Construct validity refers to how well a test or experiment measures up to its claims, specifically whether it measures what it purports to measure.
- C. Internal validity refers to the degree of confidence that the causal relationship being tested is trustworthy and not influenced by other factors.
External Validity
External validity is the extent to which the findings of a research study can be generalized to other populations, settings, and conditions beyond the specific study context.
- Crucial for applying research findings to real-world scenarios.
- Threats include selection bias, situational effects, and participant characteristics.
- Often enhanced by diverse sampling and realistic experimental designs.
Memory trick: I Can See Everything. Internal, Construct, Statistical, External.