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How is the global test score supposed to be computed based on the individual scores in the Wechsler Nonverbal Scale of Ability?

Let's say the sub-test scores are A, B, C, and D.

From there:

  • how do we obtain the global score? is it age dependent?
  • I understand that the standard deviation on the total score is 15. Is this correct?
  • how is the confidence interval computed? is it symmetric around the "measured" value?
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