July+13th+slides - Quantitative Methods in Psychology...

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Quantitative Methods in Psychology Quantitative Methods in Psychology July 13th, 2009: Variability July 13th, 2009: Variability Jeff Vietri Jeff Vietri Corresponding to chapter 4 in the text Corresponding to chapter 4 in the text
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Today's Agenda Today's Agenda Review homework Go over quiz Answer questions Chapter 4: Variability - Things are getting serious - Range - Interquartile range - Deviation / deviation scores - Variance - Standard Deviation Don't forget the homework!
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Variability Variability So far we've discussed distributions in terms of their - Central tendency - Shape The variability is also extremely important - How widely dispersed the scores are - Measured by the Range Interquartile range Variance Standard deviation - We will concern ourselves mostly with SD
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The Range The Range The most basic description of the spread of the scores is the distance between the most and least of the distribution - (Biggest X – smallest X) + 1 - Does this give us a good sense of the variability of the scores? - Influence of outliers Parking attendants and President McCormick The test bungler and ace
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The interquartile range The interquartile range Since the lowest and highest values in a
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