Yoo and colleagues (2007) examined the effects of sleep deprivation on memory and brain activation. One group of subjects were allowed to sleep normally, while the experimental group was made to stay "up all night". Data was collected on reaction time/identification (indoor/outdoor) of visual images and brain activation during an encoding session in the morning following sleep deprivation. Memory of individual images was examined 48 hours later during a recognition test.
Which of the following statements are correct about this study are correct?
This study is a good example of a QUASI-EXPERIMENTAL DESIGN.
One INDEPENDENT variable in this study would be whether subjects were allowed to sleep or whether they stayed awake all night.
One DEPENDENT variable would be the age of each subject participating in the study.
This study primarily used a WITHIN-SUBJECT design.
More than one of the other answers are correct.
None of the other answers are correct.