March 2024
Intermediate to advanced
610 pages
24h 12m
English
Content preview from Introduction to the New Statistics, 2nd Edition
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7 The Independent Groups Design
Researchers often wish to investigate the difference between two conditions—between learning achieved by rereading and by retrieval practice, for example. This chapter considers the design that compares the conditions by using separate, independent groups of participants. Then in Chapter 8 we’ll consider a second approach: the paired design, in which a single group of participants contributes data for both conditions.
This chapter starts with the basics for independent groups: the estimation approach, which focuses on the difference between the two means—our effect size—and its CI. Then I’ll introduce a different way to express that effect size, using a standardized effect size ...
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