note02 - Chapter 1: Section 2 and 3 Graphical summaries -...

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Graphical summaries - Histograms, stem and leaf plots, dot plots, scatter plots and run plots - help us visualize a list of numbers and investigate patterns. Dot Plots A graph that can be used to give a rough impression of the shape of a sample. Useful when the sample size is not too large and when the sample contains some repeated values. Histogram and Stem-and-Leaf Plots: Indication of the shape of data Stem-and-leaf plot Each item in the sample is divided into two parts: Stem: consisting of the leftmost one or two (or more) digits Leaf: consisting of the next signiFcant digit Compact way to represent the data Histogram Choose boundary points for the class intervals Compute the frequency and relative frequencies for each class Compute the density for each class, according to the formula Density = relative frequency class width Draw a rectangle for each class, whose height is equal to the density. Note: The book discusses histograms by hand in depth. We are going to be using a computer to
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This note was uploaded on 05/27/2008 for the course STA 3032 taught by Professor Kyung during the Spring '08 term at University of Florida.

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note02 - Chapter 1: Section 2 and 3 Graphical summaries -...

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