Review for Quiz:
Bar Graph or Bar Chart
Review for Quiz #103:
___________ or __________
Our General Subject for this Quiz?
What is a Bar Graph?
A bar graph is a graph that
__________________________________
___________________________________
___________________________________
___________________________________
___________________________________
3
What is a Bar Graph?
A bar graph is a graph that displays the
frequency distribution of a categorical
variable, showing values for each bar next to
each other for easy comparison.
4
Bar Graphs Q & A
What is the Bar Graph Advantage over Pie
Charts?
Bar Graphs are ____________________
_________________________________
How are Bar Graphs the Similar to Pie Charts?
Both pie charts & bar graphs can display
___________________________________
How are Bar Graphs Different from Pie Charts?
A bar graph can also compare______________
____________________________________
Data does not have to be
____________________________________ 5
Bar Graphs Q & A
What is the Bar Graph Advantage over Pie
Charts?
Bar Graphs are easier to make & to read than
pie charts.
How are Bar Graphs Different from Pie Charts?
Both pie charts & bar graphs can display the
distribution of a categorical variable.
How are Bar Graphs Different from Pie Charts?
A bar graph can also compare any set of
quantities measured in the same units. Data
does NOT have to be part of a whole.
6
Type of Variables on a Bar Graph
• x-axis variable?
Normally a ______________ Variable.
• y-axis variable?
Normally, a ______________ Variable
Then decide if the y-axis variable is _______ or
_________.
7
Type of Variables on a Bar Graph
• x-axis variable?
Normally a Categorical Variable.
• y-axis variable?
Normally, a Quantitative Variable
Then decide if the y-axis variable is Discrete or
Continuous.
8
“Would The Bar Graph Make a Good Pie
Chart?”
• If the answer is NO, you could write:
– No,__________________________________
________________________________ OR
– No,________________________________
__________________________________
• If the answer is YES, you could write:
– Yes,________________________________
_____________________________________
9
“Would The Bar Graph Make a Good Pie
Chart?”
• If the answer is NO, you could write:
– No, because these values are comparative
data only.
OR
– No, because these values do NOT represent
parts of the whole.
• If the answer is YES, you could write:
– Yes, because these values represent parts of
the whole.
10
Making a Bar Graph Look Better
What is a Pareto Chart?
A bar graph in which ________________
_________________________________
_________________________________
_________________________________
Who invented the Pareto Chart?—(name,
nationality, occupation and dates)
_________________________________
11
Making a Bar Graph Look Better
• What is a Pareto Chart?
A bar graph in which the bars are ordered
according to value, in either increasing or
decreasing order.
Who invented the Pareto Chart?
Vilfredo Pareto, Italian mathematician and
economist, 1848-1923
12
Bar Graph Characteristics
1.
2.
3.
4.
Data can be ______________________
Bars can be ______________________
The x-axis represents ___________________
The y-axis represents____________________
________________________________
5. Bars are of _______________________
________________________________
13
Bar Graph Characteristics
1. Data can be quantitative or categorical
2. Bars can be vertical or horizontal
3. The x-axis represents the category
displayed
4. The y-axis represents the quantitative
values of the variable being displayed.
y-axis begins at zero
5. Bars are of uniform width and uniformly
spaced
14
Bar Graph Characteristics
6. Consistent measurement ____________
________________________________
7. Height of bars represent ____________
_____________________________________
_____________________________________
8. The graph is well-annotated with_______
________________________________
________________________________
________________________________15
Bar Graph Characteristics
6. A consistent measurement scale is used
for each vertical bar
7. Height of bars represent the values of
the variable displayed, the frequency of
occurrence or percentage of occurrence
8. The graph is well-annotated with title,
labels for each bar, vertical scale,
horizontal categories, source
16
Bar Graph & Pie Chart Transfer Relationship
Every Pie Chart _____________________
_________________________________,
BUT______________________________
__________________________________
_________________________________.
Bar Graph  Pie Chart;
Pie Chart  Bar Graph
17
Bar Graph & Pie Chart Transfer Relationship
• Every Pie Chart COULD be made into a
Bar Graph
BUT
• NOT all Bar Graphs CAN be made into
Pie Charts
Bar Graph  Pie Chart;
Pie Chart  Bar Graph
18
Changing Scale – The Squiggle
What is a squiggle?
___________________________________
___________________________________
___________________________________
When do you use a squiggle?
__________________________________
__________________________________
__________________________________
Draw & label two different squiggle shapes & names:
_________________________________
19
Changing Scale – The Squiggle
What is a squiggle?
At least a 2-angle line on a bar graph axis that
abbreviates a scale.
When do you use a squiggle?
Use a squiggle on the changed axis whenever
you change scale in a bar graph.
Horizontal Squiggle
Vertical Squiggle
or
20
x-axis & y-axis Variables
• On a vertical bar graph,
the y-axis variable is
normally_____________
___________________
Helmets Used by Motorcyclists
Source: US Dept of Transportation
900
816
800
731
700
Number of Motorcyclists
• On a vertical bar graph,
the x-axis variable is
normally_____________
____________________
600
500
400
300
200
153
100
0
Proper Helmet
Insufficient Helmet
No Helmet
Helmet Type
Source: US Dept of Transportation
21
x-axis & y-axis Variables
Helmets Used by Motorcyclists
Source: US Dept of Transportation
900
816
800
731
700
600
Number of Motorcyclists
• On a vertical bar
graph, the y-axis
variable is normally a
quantitative variable

• On a vertical bar
graph, the x-axis
variable is normally
a categorical variable
500
400
300
200
153
100
0
Proper Helmet
Insufficient Helmet
No Helmet
Helmet Type
Source: US Dept of Transportation
Categorical Variables
22
End of Bar Graph Review
Study Tonight for Quiz—
Dragonfly #103
Test Preparation for Bar Graphs Quiz #103
(Dragonfly #103)
• Graph Paper (1 sheet)
• Calculator
Clear Lists in STAT:EDIT
• Pencil
• Eraser
• Ruler (or protractor)
• Homework to Box
New Homework to be
delivered to you
• Quiz Requires TWO
Graphs
24