CCRC - Certified Clinical Research Coordinator Scientific Concepts & Research Design Questions and Answers

Question 1

In the hierarchy of evidence for clinical research, which of the following study designs provides the most robust and reliable evidence for the efficacy of a new intervention?

Accepted Answer

Systematic review or meta-analysis of randomized controlled trials

Answer

Case-control study

Answer

Cohort study

Answer

Expert opinion

Question 2

A clinical trial is designed where neither the participants nor the investigators interacting with them know who is receiving the experimental drug and who is receiving the placebo. This type of study is best described as:

Accepted Answer

A double-blind study

Answer

A single-blind study

Answer

An open-label study

Answer

A crossover study

Question 3

A research coordinator is working on a study that investigates the association between a specific dietary habit (exposure) and the development of a rare disease. The study identifies individuals who already have the disease (cases) and a similar group without the disease (controls), and then looks back in time to compare their past dietary habits. What is this type of observational study design called?

Accepted Answer

Case-control study

Answer

Prospective cohort study

Answer

Cross-sectional study

Answer

Randomized controlled trial

Question 4

Which of the following is the primary purpose of randomization in a clinical trial?

Accepted Answer

To prevent selection bias by creating comparable study groups.

Answer

To ensure that all participants receive the investigational product.

Answer

To make it easier to recruit participants for the study.

Answer

To guarantee that the study results will be statistically significant.

Question 5

In a clinical trial, a p-value of <0.05 is typically interpreted as:

Accepted Answer

The observed result is statistically significant, and the null hypothesis is rejected.

Answer

The probability that the null hypothesis is true is less than 5%.

Answer

The result is clinically significant and proves the new treatment is superior.

Answer

There is a greater than 95% chance that the alternative hypothesis is true.

Question 6

A study is designed to test a new antihypertensive drug. During the study, the investigators provide more frequent follow-up and encouragement to the participants in the active treatment group compared to the placebo group. This is an example of what type of bias?

Accepted Answer

Performance bias

Answer

Selection bias

Answer

Recall bias

Answer

Observer bias