July+8th+slides

# 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?
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
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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