A Major Difference Between Experimental Research and Ex Post Facto

A major difference between experimental research and ex post facto research is that

A) in experimental research there are two or more groups of subjects to be compared, while in ex post facto research one group of subjects is being studied.
B) a test of significance is applied to the data collected in an experiment, while descriptive-type statistics are used to analyze data collected in an ex post facto research.
C) in experimental research the researcher is always testing a hypothesis, while in ex post facto research hypothesis testing is not involved.
D) in experimental research manipulation of variables is possible, while in ex post facto it is not possible to manipulate the variables.

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