The most reliable way to answer the question "Does Vitamin C prevent colds?" is by performing _____.
A) a nonrandomized prospective study
B) a nonrandomized baseline comparison study
C) a nonrandomized retrospective study
D) a randomized experimental study

Question

Quizplus · Accepted Answer

A randomized experimental study is the most reliable method for determining the effectiveness of a treatment, such as Vitamin C for preventing colds, because it minimizes bias and allows for the establishment of cause-and-effect relationships.

The Most Reliable Way to Answer the Question "Does Vitamin