2.2 BAR GRAPHS

Bar Graphs Similar to histograms, but may be used for qualitative data as well as quantitative. Features:  Bars may be vertical or horizontal  Bars must have uniform width and be uniformly spaced  Bar length represents the value of the variable, the frequency of occurrence or percentage of occurrence  Must include a title, labels for bars, vertical scale, or actual value of length of bar

p.48 fig 2-11 *Changing scale—use a “squiggle” or “break”

Pareto Charts  Useful in quality control programs  Organize data so problems can be determined and fixed  Bar height represents frequency  Bars arranged from left to right, decreasing height  Guided practice #2 p.49

Homework:  p. 54 #1-7 odd