Scores - HistogramĪ quick peek at some of our 100 scores on our first IQ test shows a minimum of 1 and a maximum of 6. What we see here is that standardizing scores facilitates the interpretation of a single test score. However, if my score of 5 corresponds to a z-score of 0.91, you'll know it was pretty good: it's roughly a standard deviation higher than the average (which is always zero for z-scores).
So is that good or bad? At this point, there's no way of telling because we don't know what people typically score on this test. This standard is a mean of zero and a standard deviation of 1.Ĭontrary to what many people believe, z-scores are not necessarily normally distributed.Ī group of 100 people took some IQ test. Z-scores are also known as standardized scores they are scores (or data values) that have been given a common standard. Z-Scores – What and Why? report this ad By Ruben Geert van den Berg under Statistics A-Z & T-Tests
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