lecture_02 - Statistics 400 - Lecture 2 Last class began...

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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 box-plots Will introduce box-plots later Histogram Uses rectangles to show number (or percentage) of values in intervals Y-axis usually displays counts or percentages X-Axis 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 non-overlapping 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 Michigan-Dearborn.

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lecture_02 - Statistics 400 - Lecture 2 Last class began...

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