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Lecture #5.docx

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PSYC 2021
Agnieszka Kopinska

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Lecture #5  Measures of variability: o Range o Interquartile o Variance o Standard Deviation  Parametric average: arithmetic computations involved, for example Mean. (Not usually for mode and median).  Range: upper real limit of highest score minus the lower real limit of lowest score. o Outliers (ie: extreme scores) change the range.  Median is also known as 5 percentile. If you divide range into 4 parts, 1 quarter (1 ) is 25 percentile, last quarter (Q ) is 100 percentile. 4  Formula for ‘SS’ (in lecture slides): is sum of squared deviations from the mean.  Formula fo
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