Examlex
Name two air pollutants that can come from both natural and human-related sources. Why do air pollution regulations usually focus on the human causes of air pollution?
Treatment Group
A group of subjects in an experimental study that receives the treatment or intervention being tested, as opposed to a control group that does not.
Placebo Group
A control group in an experiment that receives a sham or inert treatment, allowing researchers to measure the effect of the actual treatment against no treatment.
Significance Level
A threshold set by the researcher before an experiment to decide whether to reject the null hypothesis, typically denoted by alpha (α).
Weekly Salaries
The amount of money a person earns per week from their employment.
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