This design is similar to the pretest-posttest except that there are more than two measurements. Ideally, there are an equal number of measurement periods before and after treatment, and the period between measurements is constant. These designs can ..Read More

When conducting correlational studies, research determine whether two variables (for example, height and weight or smoking and cancer) are related to each other. Such studies assess whether the variables are “corre-lated” in some way: Do ..Read More