QUESTION 1: The advantages of random assignment in a clinical trial are: Select all that apply.

A. Help ensure that study subjects are representative of the general population.

B. Facilitates measurement of dosage of the intervention

C. Facilitate the measurement of outcome variables

D. Ensure that the study groups have comparable baseline characteristics

E. Reduce selection bias in the allocation of treatment.

QUESTION 2:

The purpose of a double blind or double masked study is to:

A. Achieve comparability of treated and untreated subjects.

B. Reduce the effects of sampling variation.

C. Avoid observer and subject bias.

D. Avoid sampling variation.

QUESTION 3:

You can express the results of an experimental study using which of the following measure(s) of association? Select all that apply.

A. Odds Ratio

B. Risk Ratio or Relative Risk

C. Attributable Risk

D. Counts

QUESTION 4:

Advantages of Experimental Studies include which of the following? Select all that apply.

A. Randomization can balance confounding factors between treatment and controls groups.

B. Blinding can reduce bias in assessment of outcomes.

C. Prospective design allows for temporality.

D. Compliance is not an issue.

E. You don't have to worry about influence from beneficiaries.