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Review for Quiz:Bar Graph or Bar Chart
Review for Quiz #103:
___________ or __________
Our General Subject for this Quiz?
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What is a Bar Graph?
A bar graph is a graph that
__________________________________
___________________________________
___________________________________
___________________________________
___________________________________
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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.
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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 ____________________________________
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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.
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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 _________.
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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.
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“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,________________________________
_____________________________________
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“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.
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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) _________________________________
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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
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Bar Graph Characteristics
1. Data can be ______________________
2. Bars can be ______________________
3. The x-axis represents ___________________
4. The y-axis represents____________________
________________________________
5. Bars are of _______________________
________________________________
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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
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Bar Graph Characteristics
6. Consistent measurement ____________
________________________________
7. Height of bars represent _________________________________________________
_____________________________________
8. The graph is well-annotated with_______
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________________________________
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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
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Bar Graph & Pie Chart Transfer Relationship
Every Pie Chart _____________________
_________________________________,
BUT______________________________
__________________________________
_________________________________.
Bar Graph Pie Chart;
Pie Chart Bar Graph
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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
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Changing Scale – The SquiggleWhat is a squiggle?
___________________________________
___________________________________
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When do you use a squiggle?
____________________________________________________________________
__________________________________Draw & label two different squiggle shapes & names:
_________________________________
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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
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x-axis & y-axis Variables
• On a vertical bar graph, the y-axis variable is normally_____________
___________________
• On a vertical bar graph, the x-axis variable is normally_________________________________
Helmets Used by Motorcyclists
731
153
816
0
100
200
300
400
500
600
700
800
900
Proper Helmet Insufficient Helmet No Helmet
Num
ber
of M
otor
cycl
ists
Source: US Dept of Transportation
Source: US Dept of Transportation
Helmet Type
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x-axis & y-axis Variables
• 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
Categorical Variables
Helmets Used by Motorcyclists
731
153
816
0
100
200
300
400
500
600
700
800
900
Proper Helmet Insufficient Helmet No Helmet
Num
ber
of M
otor
cycl
ists
Source: US Dept of Transportation
Source: US Dept of Transportation
Helmet Type
End of Bar Graph Review
Study Tonight for Quiz—
Dragonfly #103
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Test Preparation for Bar Graphs Quiz #103(Dragonfly #103)
• Graph Paper (1 sheet)
• CalculatorClear Lists in STAT:EDIT
• Pencil• Eraser• Ruler (or protractor)
• Quiz Requires TWO Graphs
• Homework to Box
New Homework to be
delivered to you
