Question

Are there reading articles describing an experiment to test the effects of caffeine on the reaction time of humans how long it took them to respond to a Particular signal in the experiment the subjects reaction time were measured then they were divided in 3 groups 1 group was given a high does of caffeine the second group was given a medium dose of caffeine the 3rd group was given a sugar pill that had no caffeine after reading 45 minutes for the caffeine to take effect, the reaction time were measured again.

In the experiment Arthur read about, what was the outcome variable (dependent variable)?

A. The amount of a caffeine given to each person.

B. The amount of time the caffeine was given to take effect.

C. The type of signal each person responded to.

D. The change in reaction times for each person.

Answer 1

D. The change in reaction times for each person — that's the outcome (dependent) variable being measured to see the effect of the caffeine doses.