PSYC 406 Chapter Notes - Chapter 2: Linear Map, Stanine, Frequency Distribution
3 Feb 2017
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Document Summary
The z score denotes the deviation of an entry or a score from the mean using sd units (so we say this score is 2 sd from the mean). When you flip a coin over many trials and record down the frequency distribution, you produce a bell-shaped curve known as symmetrical binomial probability distribution. Mccall"s t: mccall devised a system to transform raw scores to give them meaning. He set sd at 10 and the mean at 50. A z score can be transformed into a t score using the formula; It is important to make the distinction between standardization and normalization. Mccall"s t standardize scores by applying a linear transformation. These transformations do not change the characteristics of the distribution. If a distribution of scores is skewed before the transformation is applied, it will also be skewed after the transformation has been used. Quartiles and deciles: quartiles divide the frequency distribution into equal fourths.
