15. When researchers are studying the effect of new drug treatments on patients, bias can be introduced by patients if they are aware of who receives the placebo. Which type of research design eliminates this type of bias?
Answer: C
Blind study eliminates bias in research design.
A blind study ensures that participants are unaware of whether they are receiving the treatment or a placebo, thereby minimizing bias that could affect the results of the research.
A) Prospective cohort study
A prospective cohort study follows a group of individuals over time to assess the effects of a treatment or exposure. However, it does not inherently control for bias related to participants' awareness of their treatment status, which can influence their reporting and behavior.
B) Observational study
An observational study collects data without manipulating variables. While useful in many contexts, it does not prevent biases related to patient awareness of treatment allocation, as participants may still know whether they are receiving a placebo or an active treatment.
C) Blind study
A blind study effectively eliminates bias by ensuring that participants do not know if they are receiving the active treatment or the placebo. This blinding minimizes the risk of subjective influences on outcomes, making this design particularly robust for testing the efficacy of new drug treatments.
D) Time series study
A time series study examines data points collected at successive time intervals. This type of study does not address the issue of participant awareness regarding treatment allocation, and thus, it does not eliminate the potential for bias that can arise from such knowledge.
Conclusion
The blind study is the correct answer as it directly addresses the potential for bias by keeping participants unaware of their treatment group. In contrast, the other options do not provide this level of control over participant knowledge, which is crucial in ensuring the integrity of research outcomes.