In Section 6.4 I said that T scores are designed to have a mean of 50 and

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In Section 6.4 I said that T scores are designed to have a mean of 50 and a standard deviation of 10 and that the Achenbach Youth Self Report measure produces T scores. The data in Figure 6.3 do not have a mean and standard deviation of exactly 50 and 10. Why do you suppose that this is so?

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