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Why do many statistical tests work by identifying the systematic and unsystematic sources of variation and then comparing them? Was the following z-score (1.63) converted

  • Why do many statistical tests work by identifying the systematic and unsystematic sources of variation and then comparing them?
  • Was the following z-score (1.63) converted from an original score that was above the mean or below the mean? Please explain why your answer is correct.
  • Explain systematic and unsystematic variation. Provide your own example for each.

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