Unit 5 L-4B Math 8
Scatter Plots and the Line of Best-Fit – Mixed Practice
Answer each question below. Show work when appropiate.
_____1.
Which scatter plot shows the best
line of best fit?
_____2.
The equation y = 1.6x + 2 represents a
line of best fit for this scatter plot.
Based on this, what is the expected time it
takes a commuter to travel 30 miles to work?
a.
b.
c.
d.
_____3.
15 minutes
30 minutes
40 minutes
50 minutes
What can be concluded about mileage when weight increases?
a.
b.
c.
d.
Gas mileage tends to increase
Gas mileage tends to decrease
Gas mileage always increases
Gas mileage always decreases
2014-2015
_____4.
Which of the following statements best
describes the scatter plot below?
a.
b.
c.
d.
5.
The data has a negative association.
As the value of x increases, the
value of y decreases.
The data has a positive association.
As the value of x increases, the
value of y increases.
The data has no association.
As the value of x increases, the value of y does not change.
The data has a positive association. As the value of x increases, the
value of y decreases.
This scatter plot shows the relationship between
the time walked and the number of calories
burned.
Based on this, how many calories would
someone walking 60 minutes expect to burn?
6.
The scatter plot shows the average price of a major league baseball ticket from
1997 to 2006. What type of association does this graph show? Explain.
2014-2015
7.
Create a scatter plot and draw a line of best fit for the data in the table below.
a. Does the data show an association?
b. What type of association does it show?
8. The table shows the average and maximum longevity of various animals in captivity.
a. Draw a scatter plot and determine, what
association, if any, exists in the data.
b. Draw a line of best fit for the scatter plot.
c. Predict the maximum longevity for an animal
with an average longevity of 33 years.
2014-2015
9.
A teacher collected data on 20 students
for two different quizzes. The
scatterplot below shows the relationship
between the number of points scored on
Quiz 1 and the number of points scored
on Quiz 2.
Which statement describes the data?
a.
The number of points scored on Quiz 2 was less than the number of points scored on
Quiz 1 for any student who scored at least 50 points on Quiz 1.
b.
The number of points scored on Quiz 2 was greater than the number of points
scored on Quiz 1 for any student who scored 50 or fewer points on Quiz 1.
c.
The number of points scored on Quiz 2 was greater than the number of points
scored on Quiz 1 for any student who scored at least 50 points on Quiz 1.
d.
The number of points scored on Quiz 2 was less than the number of points scored on
Quiz 1 for any student who scored 50 or fewer points on Quiz 1.
10.
A dentist made the scatterplot below to show the number of cavities her patients
had as it relates to the number of times they flossed their teeth each week.
Which graph below represents the scatterplot with the best trend line?
a.
b.
c.
2014-2015