What is the purpose for using a control group in an experiment?
a. It provides a baseline to evaluate the size of the treatment effect.
b. It minimizes the threat of a confounding variable.
c. It is necessary to ensure the internal validity of the study.
d. It is necessary to ensure the external validity of the study.
Question 2
In sampling notation, n refers to the ____.
a. number of cases in the sampling frame
b. number of cases in the population
c. number of possible units in the sample
d. sampling fraction
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