PSYC301-01Sept20Lecture(ForPosting)

PSYC301-01Sept20Lecture(ForPosting) - PUREMEM 1. 2. 3. 4....

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PUREMEM 1. Drawing a histogram is a way of using stats to describe the behavior of a whole sample of subjects. Calculating a Z score is a way of describing the behavior of what? Behavior of an individual subject 2. What would a subject’s Z score be if her raw score was one and a half times the average amount above the mean? Don’t forget that +/- matters! +1.5 3. Suppose there are two subjects, A and B. Subject A’s Z score is larger than Subject B’s. Whose behavior is more unusual? Subject A’s 4. Suppose the mean on a variable is 15 and the SD is 5. Change a raw score of 5 to a Z score. Don’t forget that +/- matters! (5-15)/5 = -10/5 = -2.0 Z = -2.0
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Using Z scores with the normal distribution
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What are Z scores for? For describing how unusual (or not) a single subject is Large Z (positive or negative) means subject is unusual, small Z (positive or negative) means subject is not unusual Z scores can be used for this purpose no matter how scores are distributed
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What are Z scores for? If and only if you are studying a behavior distributed as above, you can also use Z scores for the following: A subject’s Z score lets you say what proportion of other subjects scored lower or higher than the subject
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Frequency table, bar graph, or histogram? Uni- or multimodal? Symmetrical or skewed? Shaped like what object? Common or uncommon? Where is single most common score? Where is mean score? Is there variability among the scores?
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PSYC301-01Sept20Lecture(ForPosting) - PUREMEM 1. 2. 3. 4....

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