Info project 4
danya.alsinan
5INFO1010MultiVariableDescriptiveStats.pptxINFO 1010
MULTI VARIABLE DESCRIPTIVE STATISTICS
AND CHARTS
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1
Scatterplot: Summarizing Data for Two Variables Using Graphical Displays
Crosstabulation: Summarizing Data for Two Variables Using Tables
Data Visualization: Best Practices in Creating Effective Graphical Displays
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Price
Range
French Italian Duplex Appt
Total
< $250,000
> $250,000
18 6 19 12
55
45
30 20 35 15
Total
100
12 14 16 3
Home Style
Crosstabulation
Example: Daniel’s Homes
The number of homes sold for each style and price for the past two years is shown below.
quantitative
variable
categorical
variable
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A scatter diagram is a graphical presentation of the relationship between two quantitative variables.
One variable is shown on the horizontal axis and the other variable is shown on the vertical axis.
The general pattern of the plotted points suggests the overall relationship between the variables.
A trendline provides an approximation of the relationship.
Scatter Diagram and Trendline
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Scatter Diagram
Positive Trend
x
y
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Scatter Diagram
Negative Relationship
x
y
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Scatter Diagram
No Apparent Relationship
x
y
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1
3
2
1
3
14
24
18
17
30
x = Number of
Interceptions
y = Number of
Points Scored
Scatter Diagram
The Broncos football team is interested in
investigating the relationship, if any, between
interceptions made and points scored.
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Scatter Diagram and Trendline
y
x
Number of Interceptions
Number of Points Scored
5
10
15
20
25
30
0
35
1
2
3
0
4
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