Psychology 242 - Descriptive Stats 3 WP

Psychology 242 - Descriptive Stats 3 WP - Z-Scores Research...

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Z-Scores
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Research questions with more than one variable When we are studying more than one variable, we are typically asking one (or more) of the following two questions: How does a person’s score on the first variable compare to his or her score on a second variable? How do scores on one variable vary as a function of scores on a second variable?
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Making Sense of Scores Let’s work with this first issue for a moment. Let’s assume we have Marc’s scores on his first two Psych 242 exams. Marc has a score of 50 on his first exam and a score of 50 on his second exam. On which exam did Marc do best?
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GRADE 0 20 40 60 80 100 0 5 10 15 In one case, Marc’s exam score is 10 points above the mean In the other case, Marc’s exam score is 10 points below the mean In an important sense, we must interpret Marc’s grade relative to the average performance of the class Exam1 Exam2 Mean Exam2 = 60 Example 1 Mean Exam1 = 40
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Both distributions have the same mean (40), but
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Psychology 242 - Descriptive Stats 3 WP - Z-Scores Research...

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