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Experimental Design

I. Between-subject design

1.  With Subject Independent Variables -- between-subject designs are sometimes used because they are the only option.  If the IV is a subject (or a non-manipulated) variable, we cannot assign people to both levels.

2. With certain Manipulated IVs -- It is sometimes the case that when subjects    participate in one condition, the experience they gain will make it    impossible for them to participate in other conditions.  They have changes somehow and there is no going back.

3. Disadvantages:

4. The problem of creating equivalent groups


II. Within-Subject Designs

1. Advantages