Z Score Fact Sheet

  • Z scores are used to compare data points are different normal distributions
  • Perhaps your friend recieved a 78 on their Probability exam but you recieved a 66, how do we know who really did better??? The answer: Z-Score
  • We need to use the mean of both classes and the standard deviation to help us come to our conclusion
  • We need to consider the spread of the curve as well
  • If the z score value is negative we say, " # standard deviations below the mean" and if the z score is positive we say, "# standard deviations above the mean"

Formula

Videos/Examples

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