MCAT Math Question 24: Answer and Explanation
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Question: 24
9. Which of the following relationships between measurement error and overall error is correct?
- A. Unreliable data leads to confounding.
- B. Invalid data leads to confounding.
- C. Unreliable data leads to bias.
- D. Invalid data leads to bias.
Correct Answer: D
Explanation:
Data that is off in a systematic way (reads at a value that is not the true value) will cause bias. This type of data error is an example of a lack of validity (or accuracy). Unreliable data suffers from random, not systematic, error. Confounding arises from errors in data analysis, not data collection.