BIAS Past Paper questions

BIAS Past Paper Questions

1 / 6

A clinician notices a tendency to underreport adverse events in a trial’s final report. This is an example of:

C) Selection bias

E) Confounding bias

B) Observer bias

A) Reporting bias

D) Recall bias

2 / 6

In a blinded trial, participants and clinicians are unaware of treatment allocation, but raters are not. Which bias is MOST likely introduced?

A) Performance bias

E) Publication bias

C) Ascertainment bias

D) Attrition bias

B) Detection bias

3 / 6

Intention-to-treat (ITT) analysis in randomized controlled trials (RCTs) is primarily used to:

C) Reduce type I errors

B) Prevent bias by preserving randomization integrity

E) Increase statistical power

D) Ensure protocol adherence

A) Eliminate recall bias

4 / 6

Which study design BEST minimizes attrition bias in longitudinal research?

C) Randomized controlled trial

B) Case-control study

A) Cohort study

E) Nested case-control

D) Cross-sectional study

5 / 6

Internal validity in research design ensures:

B) Accurate measurement of variables

E) Ethical compliance

C) Absence of confounding factors

A) Generalizability to real-world settings

D) Reproducibility of results

6 / 6

A study finds no difference in depression scores between two therapies but reports significant improvements in sleep as a secondary outcome. This MOST likely indicates:

A) Reporting bias

E) Random error

D) Observer bias

C) Selection bias

B) Confounding bias

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