What percentage of scores is between a z of -2 and a z of +2? Why is this important?
Added by Bernard A.
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It is measured in terms of standard deviations from the mean. If a z-score is 0, it indicates that the data point's score is identical to the mean score. A z-score of -2 means the score is 2 standard deviations below the mean, and a z-score of +2 means the score Show more…
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