To assess the effectiveness of flu vaccine for county residents,Mr.McCallum wants to administer vaccine injections to all county residents rather than give half of them a placebo injection.Mr.McCallum is most clearly underestimating the importance of
A) testing a large sample.
B) operationally defining his procedures.
C) replicating observations of other researchers.
D) creating a control group.

Question

Quizplus · Accepted Answer

Mr. McCallum is underestimating the importance of creating a control group in his study design. Without a control group, it would be difficult to determine if any observed changes in vaccination rates were due to the vaccine or other factors. Testing a large sample, operationally defining procedures, and replicating observations of other researchers are all important considerations, but none of these directly address the issue of having a control group.

To Assess the Effectiveness of Flu Vaccine for County Residents,Mr