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Step 2 convert 89 - PowerPoint PPT Presentation

The Normal distribution and z-scores:

The Normal distribution and z-scores:. The Normal curve is a mathematical abstraction which conveniently describes ("models") many frequency distributions of scores in real-life. The area under the curve is directly proportional to the relative frequency of observations.

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About 68% of scores fall in the range of the mean plus and minus 1 SD;

68%. 85 (mean - 1 SD) 115 (mean + 1 SD). About 68% of scores fall in the range of the mean plus and minus 1 SD; 95% in the range of the mean +/- 2 SDs; 99.7% in the range of the mean +/- 3 SDs. e.g. IQ is normally distributed (mean = 100, SD = 15).

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Step 2 convert 89 - PowerPoint PPT Presentation

The Normal distribution and z-scores:

About 68% of scores fall in the range of the mean plus and minus 1 SD;