A data value is considered significantly low or significantly high if its z-score is less than -2 or greater than 2.
What does it mean if z-score is 2?
- A positive z-score indicates the raw score is higher than the mean average.
- For example, if a z-score is equal to +1, it is 1 standard deviation above the mean.
- A negative z-score reveals the raw score is below the mean average.
- For example, if a z-score is equal to -2, it is 2 standard deviations below the mean.
What does a standard deviation of 2 mean?
- Standard deviation tells you how spread out the data is. It is a measure of how far each observed value is from the mean.
- In any distribution, about 95% of values will be within 2 standard deviations of the mean.
Learn more about standard deviation
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The correct question is -
A data value is considered _______ if its z-score is less than minus−2 or greater than 2.
