This section shows the difference between a study and an experiment.
Vocabulary
Experiment - the researcher controls one or more of the explanatory variables.
Observational Study - the researcher does not control the value of any variable but simply observes the values as they exist.
Randomized Experiment - the value of the explanatory variable for each unit is determined randomly, before the response variable is measured.
Randomized Comparative Experiment - randomly assign cases to different treatment groups and then compare results on the response variables.
Match Pairs Experiment - each case gets both treatments in random order, and we examine individual differences in the response variable between the two treatments.
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