Treatment: In an experiment, the manner in which
researchers handle subjects is called a treatment. Researchers are
specifically interested in how different treatments might yield
differing results.
Observational Study: An observational study is when an experimenter watches a group of subjects and does not introduce a treatment.
Example: A Survey or collection of data.
Independent Variable: The independent variable of a
study is the variable that experimenters choose to manipulate; it is
usually plotted along the x-axis of a graph.
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