How to talk about a set of
numbers?
Put them in order
2. Graph them
1.
Rules
 Label axes
 Divide up the axes evenly
When? What?
 Histogram
 Bar Chart
 Stacked Bar Chart
 Line Chart
 Pie Chart
Histogram vs Bar Chart
HISTOGRAM
BAR CHART
 The bars must touch
 The bar doesn’t have to touch
 Data is grouped
 Data isn’t grouped
 Ex: Comparing numbers of
 Ex: Comparing total revenue
companies that earn $020,000, $20,000-$40,000,
$40,000-$60,000
of different companies
Histogram
Mass of Fishes (kg):
10
11.4 11.8 12
12.5
12.7
13.1
13.5
13.8
13.9
14
14
14.3
14.6
14.8
14.8
14.9
15
15.2
15.3
15.7
15.8
15.9
16
16.2
16.9
17.1
17.4
17.9
Histogram
Bar Chart
 Fish A : 5kg
 Fish B : 4kg
 Fish C : 7kg
 Fish D : 10kg
 Fish E : 8kg
Segmented Bar Chart
Breakdown of HP Revenue in 2007 - 2009
Laptop
Printer
Ink
2007
60%
25%
15%
2008
50%
15%
35%
2009
40%
10%
50%
Percentage
Segmented Bar Chart
Year
Pie Chart
 Showing proportion of
parts to a whole
 Radii from the center
 Make the biggest part
appears first, start at 12
o’clock and clockwise
 Several small segments
grouped into one
category
 Differentiate wedge with
colors
 Keep labels horizontal
Line Chart
 Illustrate changes over time
 Vertical axes (y-axes) : Dependent Variable
 Horizontal axes (x-axes) : Independent Variable
 Multiple Line chart: compare
Line Chart
Year