PSYC 3090 Chapter Notes - Chapter 3: Educational Assessment, Squared Deviations From The Mean, Karl Pearson
24 Feb 2015
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Chapter 3: a statistics refresher: test scores are frequently expressed as numbers, and statistical tools are used to describe, make inferences from, and draw conclusions about numbers. Every test-taker is presumed to have some ability: because there is no zero point on an ordinal scale, the ways in which data from such scales can be analyzed statistically are limited. Consumer (of graphed data), beware: although 2 graphs may be accurate with respect to the data they represent, their pictures may be vastly different, ex. The charred house chain serves charbroiled, thin burgers formed in the shape of little triangular houses. On the chain"s 10th anniversary, it distributed a press announcing over a billion served": reports from 2 business publications set out to research and write an article on this burger restaurant chain. One reporter wrote that sale fluctuate from year to year, while another reporter wrote that sales stay steady, both shown in 2 different graphs.
