Chapter 3
Graphs From Frequency Distributions

I. Conventions for the construction of graphs

II. Histograms. . . . Bars plotted at Real Limits

Creating a Histogram (a worked problem)

III. Polygons. . . . Line Graphs

A. Frequency Polygons. . . . Plot Frequency at Midpoint

Creating a Frequency Polygon (a worked problem)

B. Relative Frequency Polygons. . . . Plot RF at Midpoint

Creating a Relative Frequency Polygon (a worked problem)

C. Cumulative Percent Polygons. . . . Plot C% at Upper Real Limit

Creating a Cumulative Percent Polygon (a worked problem)

IV. How frequency distributions differ

A. Central Location

B. Variation

Copyright © 2004 by Mark W. Vernoy