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Unformatted text preview: Statistics 400  Lecture 2 Last class began Chapter 2 Introduced main types of data; Quantitative and Qualitative (or Categorical) Discussed ways to describe quantitative data with plots; Bar Chart (or Pareto Plot) & Pie Chart Which is more flexible  Pie Chart or Bar Chart? Why? Is there a difference in shape of a Bar Chart if show counts or percentages? Plots for Quantitative Variables Can summarize quantitative data using plots Most common plots  histogram and boxplots Will introduce boxplots later Histogram Uses rectangles to show number (or percentage) of values in intervals Yaxis usually displays counts or percentages XAxis usually shows intervals Rectangles are all the same width 6 8 10 12 14 16 2 4 6 8 Data Counts Constructing a Histogram Find minimum and maximum values of the data Divide range of data into nonoverlapping intervals of equal length Count number of observations in each interval Height of rectangle is number (or percentage) of observations falling in the interval Example...
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This note was uploaded on 02/06/2012 for the course STAT 400 taught by Professor Derekbingham during the Fall '01 term at University of MichiganDearborn.
 Fall '01
 DerekBingham
 Statistics

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