Which energy drink is better? In a study, researchers randomly assigned 50 similar adults to one of three groups. All subjects were allowed to sleep for eight hours followed by staying awake for ten hours. Depending on which group they were assigned to, subjects then drank 12 ounces of strong coffee, a name brand "5- hour" energy drink, or 16 oz of a name brand sports drink containing caffeine and vitamins. Afterwards, subjects were measured for mental fatigue. Researchers found that the adults that drank strong coffee after being awake for ten hours were less fatigued than either those who drank the "5- hour" energy drink or the sports drink. For this controlled experiment, identify the treatment and the response variables.
A) Treatment: Strong coffee, 5-hour energy drink, and sports drink. Response: Change in mental
fatigue.
B) Treatment: Strong coffee only. Response: Change in mental fatigue.
C) Treatment: Change in mental fatigue. Response: Strong coffee, 5-hour energy drink, and
sports drink

Question

Quizplus · Accepted Answer

The treatment variable is the independent variable that is manipulated by the researcher, and the response variable is the dependent variable that is measured. In this experiment, the treatment variable is the type of drink consumed (strong coffee, 5-hour energy drink, or sports drink), and the response variable is the change in mental fatigue.

Which Energy Drink Is Better? in a Study, Researchers Randomly