July+8th+slides - Quantitative Methods in Psychology July...

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Quantitative Methods in Psychology July 8th, 2009 Jeff Vietri Corresponding to chapters 2 in the text
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Frequency distribution ∑f = n ∑X = f1(X1) + f2(X2) + f3(X3)… Percent of data in category A = fA/ ∑f Histograms: bars touch because interval/ratio data - Why is this? Bar graph: bars don’t touch because nominal/ordinal - Why?
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Frequency tables When you have a relatively small range of values, you can use a frequency table. - The first column is X, the second column is the corresponding f X f
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Grouped frequency tables When there are more than 10 or so values, it's best to group the observations in equal intervals Lower bound of category should be multiple of width
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Percentiles Sometimes we would like to describe a single score in the context of the distribution it comes from - Where does my height fall in the distribution of male adults in the United States? - Where is my test score in the distribution of the scores in class?
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