Question

I got "personal perception of being tired" wrong. what is the correct answer? please support with an explanation for how all the answers are right or wrong for the question. It will be marked down if the answers given are wrong, thank you!

Question 2 1 pts In this double-blind, randomized, 37-hr sleep deprivation study, 15 military pilot stu-dents received either placebo or 200 mg of caffeine twice a day. Vigilance was as-sessed 6 times and learning 4 times, both in a computerized environment. Motiva-tion, mood, and sleepiness were monitored using self-ratings. In the vigilance test, sleep deprivation decreased the amount of correct detections and increased reaction times in both groups. Furthermore, the number of false alarms increased in the pla-cebo group. Participants receiving caffeine showed overconfidence, as they did not report any clear decline in subjectively assessed success despite impaired perfor-mance in the vigilance test. What is the independant variable? Caffeine Personal perception of being tired Reaction time Sleep

Answer 1

The correct answer is Option A. The independent variable is caffeine. It is stated that the participants either received caffeine or placebo. Hence this was variable that was manipulated by the researcher.