PSY 380 Lecture 5: PTA Lecture 5
8 Mar 2016
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Hump on the right - negatively skewed. Hump on the left - positive skewed. Tail or outliers run out towards negative end of x axis. Outliers run out towards positive side of x axis. Tells you something about population or target population. Are you capturing symptoms that youre interested in the right kind of. Presence of skew is not a problem always obtained on a test. Scores that have been normalized statistically from a set of skewed scores. Derived from set of score that were originally skewed but then once. Others in age group, race and sex. Want to know about characteristics of standardized group. Are they similar to those that the standard scores are based on. Compare individual performance to that of normative group: Criterion referenced testing aka content referenced testing. Compare individual performance to set level or standard.
