Maria has been asked to be a subject in a study to determine if additional vitamin A will promote the growth of healthy, strong fingernails. Since she wants the study to be as close to the “ideal” nutrition intervention study as possible, she will want to be sure that:
A)only the researcher knows which participants receive vitamin A.
B)all of the participants are between 18 and 25 years of age.
C)her chances of getting vitamin A are better than those of anyone else.
D)half of the participants get something that looks like additional vitamin A but isn't.

Question

Quizplus · Accepted Answer

Option D suggests implementing a double-blind study design, where half of the participants receive a placebo instead of vitamin A. This design is widely used in nutrition intervention studies to eliminate the potential for bias and ensure the validity and reliability of the study results. Options A and C are not relevant to the study design, and option B is not essential as long as the study includes a diverse group of participants who meet the inclusion criteria.

Maria Has Been Asked to Be a Subject in a Study