Preview: Testing for the differences between two means is a relatively straightforward exercise, but what happens when there are three or more groups? These multiple groups may have means that differ significantly from one another, which makes the comparison process much more complicated. Fortunately, there is a way to test the means no matter how many groups are involved. For example, if a researcher wanted to study the impact of listening to music on student test scores, she could randomly divide the class into three groups of students. One group would listen to popular music while they study or do homework. The second group would listen to classical music while studying and the third group would study in silence. ...
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