Selection bias in studies occurs when:

A The sample perfectly represents the population

B The sample is not representative due to the method of participant selection

C Randomization is perfect

D All patients are included

✓ Correct Answer: Option B

Selection bias arises when study participants differ systematically from the target population.

💡 Why is B) the correct answer?

The correct answer to the question "Selection bias in studies occurs when:" is Option B: The sample is not representative due to the method of participant selection.

The other options — A) The sample perfectly represents the population, C) Randomization is perfect, D) All patients are included — are incorrect for this PCAT Exam Prep question. As explained above: Selection bias arises when study participants differ systematically from the target population.

📚 About This PCAT Exam Prep Practice Question

This 2-level PCAT Exam Prep question from the Critical Reading topic is part of BrainForge Quiz's free exam preparation library. Each question includes the correct answer and a detailed explanation to help you understand the underlying concept, not just memorize the answer.

How to use this page: Read the question above, consider all four options (A through D), then check the highlighted correct answer and explanation. For active timed practice, start a free PCAT Exam Prep practice test or use flashcards for spaced repetition review.

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Selection bias in studies occurs when:

✓ Correct Answer: Option B

📚 About This PCAT Exam Prep Practice Question

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