In a study that seeks to evaluate the effect caffeine has on narcoleptics,40 narcoleptic patients are randomly selected to participate.Fifteen of the patients are given high doses of caffeine,15 are given moderate doses,and 10 are given low doses over a period of 30 days.The total amount of time they slept over the 30 days was recorded.This is BEST described as a(n)_____ study.
A) voluntary
B) observational
C) dosage
D) experimental

Question

Quizplus · Accepted Answer

This study is an experimental study because the researcher is actively manipulating the caffeine doses given to the participants and recording their response. The study is not voluntary or observational, as the participants were randomly selected and assigned to a specific dose group. The term "dosage" is not a study design but rather refers to the specific variable being manipulated in this experimental study.

In a Study That Seeks to Evaluate the Effect Caffeine