10. Testing Differences Between Means: The Analysis of Variance

Chapter 8, “Testing Differences Between Means: The Basics,” and Chapter 9, “Testing Differences Between Means: Further Issues,” went into some detail about how to use z-tests and t-tests to determine the probability that two group means come from the same population. Chapter 10 tries to convince you to use a different method when you’re interested in three means or more.

The need to test whether three or more means come from different populations comes up frequently. There are more than two major political organizations ...

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