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distribution of a variable
tells what values the variable assumes and how often it takes these values
simple plot that allows one to visualize a relatively small data set. not convenient is data set is large.
common distribution graph for one variable data. areas of bars represent percent. histogram shows distribution of values of a quantitative variable. choice of bin width changes how histogram looks
compares sizes of different items, used to display frequencies related to categorical variables
effective for small data set, include a key, split stems split one category into multiple, back-to-back = two stemplots in one to compare
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