Examlex
Middle-aged people may tire more easily than they did when they were younger. Therefore, they may get less sleep than when they were younger.
Control Group
In experimental research, a group of subjects that does not receive the experimental treatment and is used as a benchmark to measure the effects of the treatment.
Sugar Pills
Placebo tablets made of inert ingredients, used in medical trials to examine the effect of treatments without drug involvement.
ADHD
Attention Deficit Hyperactivity Disorder, a behavioral condition characterized by inattention, hyperactivity, and impulsivity.
Independent Variables
Factors in an experimental study that are manipulated or changed to determine their effect on dependent variables.
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