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What does the standard deviation ( SD ) tell us and what components are involved to compute SD? List at least 2. Explain the result

What doesthestandard deviation(SD) tell usand what components are involved to compute SD? List at least 2.
Explain the resultif a score is +1 Standard Deviationfrom themean? What would that tell you?
Define what az-scoreis (this is an introduction to Ch. 5)?

please and thank you.

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