March 2024
Intermediate to advanced
610 pages
24h 12m
English
Content preview from Introduction to the New Statistics, 2nd Edition
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15 Extended Designs: Two Independent Variables
In this chapter we’ll add a second independent variable. We could, for example, study rereading and retrieval practice in different disciplines, by investigating, say, the extent that a quiz giving retrieval practice might work differently in engineering and in philosophy. Discipline would be the second IV and we would have a two-way design. We could use four independent groups, one for each combination of study strategy (Reread or Quiz) with discipline (Engineering or Philosophy). That would be a two-way independent groups design.
A two-way design is efficient, because it allows us to ask more questions in a single experiment—questions about each of the IVs. ...
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