METHODS OF DATA ANALYSIS
MEASURES OF DISPERSION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Adam’s Z-score on a test is +2.5. What does this mean?
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He’d better start studying.
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He did better than EVERYONE.
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He scored 2.5 standard deviations above the average.
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He did terrible.
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Explanation:
Detailed explanation-1: -Adam’s Z-score on a test is +2.5. What does this mean? He did better than EVERYONE. He scored 2.5 standard deviations above the average.
Detailed explanation-2: -Z-scores are standard deviations. If, for example, a tool returns a z-score of +2.5, you would say that the result is 2.5 standard deviations. Both z-scores and p-values are associated with the standard normal distribution as shown below.
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