Page 119 - Math Course 1 (Book 1)

Algebra: Scatter Plots

Interpret a Scatter Plot

Let’s Begin
Example

Determine whether a scatter
Construct a Scatter Plot plot of the height of a basketball
player and number of rebounds might show a
positive, negative, or no relationship. Explain
BREAD your answer.

The table shows the average cost of a loaf of y
bread from 1920–2000. Make a scatter plot of
the data. 10
8
Year 1920 1930 1940 6

Cents 12 9 8 Rebounds 4
2

Year 1950 1960 1970 66 68 70 72 74
Height (in.) X

Cents 14 20 24
Answer positive relationship

Year 1980 1990 2000
As the height increases, the number of
rebounds increases.
Cents 52 72 99

Let the horizontal axis, or x-axis, represent REAL WORLD EXAMPLE
the year. Let the vertical axis, or y-axis,
represent the cost.
TEMPERATURE
y
A. The table shows temperatures in degrees
90 Celsius and the corresponding temperatures
in degrees Fahrenheit. Make a scatter plot of
80
the data.
70 0F 32 41 50 59 68 77 86
Cost(Cents) 60 0C 0 5 10 15 20 25 30

50
40
30 90 y

20 80
10 70
60
‘20 ‘30 ‘40 ‘50 ‘60 ‘70 ‘80 ‘90 ‘00 0F
X 50
Year
40
Then graph ordered pairs (years, cost).
30

5 10 15 20 25 30 35 40
0C X
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