8 Scatter Plots and Trend Line Practice
(1) In each situation, tell whether the correlation is
positive, negative or none. Explain.
a. the number of practice free throws you take and
the number of free throws you make in a game
b. students score on a test and the number of
incorrect answers
Name:
(2) In each situation, tell whether the correlation is
positive, negative or none. Explain.
a. the number of hours worked and an employee’s
wages
b. a drop in the price of a barrel of oil and the
amount of gasoline sold
(3) Describe the correlation of the graph.
(4) Describe the correlation of the graph.
(5) Describe the correlation of the graph.
(6) Describe the correlation of the graph.
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8 Scatter Plots and Trend Line Practice
Name:
(7) MULTIPLE CHOICE (2011). The scatter plot shows
the cost (y) of ground shipping packages from
Macungie, PA to Tampa, FL, based on the
package weight (x).
a.
b.
c.
d.
y  0.37 x  1.57
y  0.37 x  10.11
y  0.68 x  2.32
y  0.68 x  6.61
(8) MULTIPLE CHOICE (2014-61%). Lubens heated a beaker of water in Biology
class. The scatter plot below shows the temperature (y), in degrees Celsius
(°C), of the water based on the number of minutes (x) he heated the water.
a. y  5.3 x  12
b. y  5.3 x  23
c. y  5.3x  23
d. y  5.3x  50
(9) MULTIPLE CHOICE (2014-72%). The scatter plot below
shows the arm spans and heights of 20 people in Kayla’s
class. Based on the line of best fit, which is most likely the
height of a person with an arm span of 200 cm?
a. 188 cm
b. 192 cm
c. 197 cm
d. 205 cm
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8 Scatter Plots and Trend Line Practice
Name:
(10) MULTIPLE CHOICE (2015-37%). Michelle went on
a bicycle trip. The scatter plot below shows the
distance she had traveled for various lengths of
time during the bicycle trip. Which equation
describes the line of best fit for the scatter plot?
11
13
m
50
20
50
13
m
b. d 
11
20
11
m  50
c. d 
50
50
m  50
d. d 
11
a.
d
(11) MULTIPLE CHOICE (2015-74%). Marti has been
keeping track of the number of visitors to her
new website for the past 9 months. The line
graph below shows the data Marti recorded.
Based on the trend shown in the graph, which
will most likely be the number of visitors to
Marti’s website for the 12th month?
a. 5000
b. 6000
c. 8000
d. 10,000
(12) MULTIPLE CHOICE (2015-58%). Hank counted the number of scratches on
cars of different ages. Hank then created the scatter plot below showing
the relationship between the age of car (x) and the number of scratches
found on the car (y). Based on the line of best fit, which is most likely the
number of scratches that could be found on a car that is 30 years old?
a. 30
b. 74
c. 87
d. 100
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8 Scatter Plots and Trend Line Practice
Name:
(13) The table below shows the predicted annual cost for a middle income family to raise a child from birth until age 15.
17000
16000
annual cost
15000
14000
13000
12000
11000
10000
9000
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
age (years)
a.) Create a scatter plot.
b.) Draw a trend line on your scatter plot. Identify
Cost of Raising a Child Born in 2003
Child’s Age
3
6
9
12
15
Annual Cost 10,700 11,700 12,600 15,000 16,700
two points on the trend line and write an
equation for the line containing those points.
c.) What is the meaning of x and y variables in the equation you wrote? Interpret the meaning of slope and the yintercept of your trend line.
d.) Use your equation to predict the cost of the child at 18 years of age.
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8 Scatter Plots and Trend Line Practice
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
powerboat manatees
registrations
killed
447
13
460
21
481
24
498
16
513
24
512
20
526
15
559
34
585
33
614
33
645
39
675
43
711
50
719
47
(14) The table shows the number of powerboat registrations and the number of
manatees killed. 55
50
45
40
35
mantees killed
Year
Name:
30
25
a.) Draw a trend line on your scatter plot.
b.) Identify two points on the trend line and write an
20
equation for the line containing those points.
15
10
5
400
500
600
700
800
powerboat registrations
c.) What is the meaning of x and y variables in the equation you wrote? Interpret the meaning of slope and the yintercept of your trend line.
d.) Use your equation to predict the number of manatees killed if 1500 powerboats are registered in 2016.
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8 Scatter Plots and Trend Line Practice
Name:
(15) The table below shows the height of a child since kindergarten.
70
65
60
55
Height
Grade Age Height
K
5
42
1
6
44.5
2
7 46.25
3
8
50
4
9
53.5
5
10 56.25
6
11 59.25
7
12 63.25
8
13
68
50
45
40
35
30
4
6
8
10
12
14
Age
a.) Draw a trend line on your scatter plot.
b.) Identify two points on the trend line and write an equation for the line containing those points.
c.) What is the meaning of x and y variables in the equation you wrote? Interpret the meaning of slope and the yintercept of your trend line.
d.) Use your equation to predict the height of this student when they reach 18.
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