Titlebook: Statistical Methods in Education and Psychology; Albert K. Kurtz,Samuel T. Mayo Book 1979 Springer-Verlag New York Inc. 1979 Finite.Statis

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Normal Probability Curve,By far the best known distribution curve in statistics is the normal probability curve.* Unlike some curves with two peaks, this one has only one high point. One reason it is so well known is that it has so many uses. Since the normal probability curve is widely used, it is important for us to know about some of its uses.

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Regression Equations,A . is an equation for predicting the most probable value of one variable from the known value of another. Regression equations are used, for instance, to predict such different things as college success, a life insurance agent’s average weekly commissions, or even marital happiness from the score on an appropriate objective test.

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Averages,and the records may be given in a more condensed form such as a single column of scores or a mere listing of them. As an illustration, Table 2.1 presents the Intelligence Quotients (IQs) of the sixth-grade students in the El Dorado School at Stockton, California as estimated from the California Short-Form Test of Mental Maturity.

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Percentiles and Percentile Ranks,is written as ... The middle of a distribution, or the point below which 50 percent of the cases lie, is, of course, the fiftieth percentile. In Chapter 2 we learned another name for this value—the median. The median is probably computed, used, and discussed more than any other percentile.

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