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Q: How are group means, percentages, and correlations used to describe research results
A: Thus far we’ve covered the key descriptive statistics—the mean, median, mode, and standard deviation—and we’ve learned how to test the difference between means. [ But often we want to know how two things (usually called "variables" because they vary from high to low) are related to each other. For example, we might want to know whether reading scores are related to math scores, i.e., whether
students who have high reading scores also have high math scores, and vice versa. The statistical technique for determining the degree to which two variables are related (i.e., the degree to which they co-vary) is, not surprisingly, called correlation. There are several different types of correlation, and we’ll talk about them later, but in this lesson we’re going to spend most of the time on the most commonly used type of correlation: the Pearson Product Moment Correlation. ]
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