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List at least four actions that help increase the quality and length of sleep.
Masked Design
An experiment in which participants do not know whether they are in the experimental or the control condition. Previously called a blind design.
Researcher's Expectations
The preconceived notions or hypotheses that a researcher may have before conducting an experiment or study.
Random-Assignment Design
A research method used to evenly distribute participants across various groups by chance, minimizing pre-existing differences between those groups.
Control Group
In experimental research, a group of subjects that does not receive the treatment being tested, used as a benchmark to measure the effects of the treatment on the experimental group.
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