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In the mid-1950s, which artist had record sales second only to Elvis Presley?
First Cause
A philosophical concept referring to the initial cause of a chain of events, often discussed in the context of the origin of the universe.
Controlled Experiment
An experiment in which all variables are kept constant except for the independent variable(s).
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.
Experimental Group
A group in an experiment that receives the variable being tested.
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