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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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 Fall '01
 DerekBingham
 Statistics, Interquartile range, Quartile, muzzle velocity

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