Which of the following is part of an ex post facto study but not an experimental study?

Question

Quizplus · Accepted Answer

An ex post facto study involves collecting data after the fact, without manipulation of variables. Inclusion of a subject variable (e.g. age, gender) is a part of an ex post facto study but not necessarily an experimental study, where manipulation of an independent variable is necessary. Control of extraneous variables and measurement of a dependent variable can be included in both types of studies.

Which of the Following Is Part of an Ex Post