NAME DATE PERIOD Lesson 1 Homework Practice -...

Course 3 • Chapter 9 Scatter Plots and Data Analysis 129

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.Lesson 1 Homework PracticeScatter Plots

Interpret each scatter plot.

1.

100

200

300

400

500

6

4

2

8

10

Gam

es W

on

Average Game Attendance

0

y

x

2.

30

20

10

40

50

60

70

80

90

100

Car V

alue

(% c

ost n

ew)

Car Age (yr)0

y

x642 8 10

3.

30

20

10

40

50

Pum

pkin

Wei

ght

(pou

nds)

Growth Time (days)0

y

x906030 120150

4. RIVER Construct a scatter plot of the river’s width and the water’s speed. River Width (m) 15 18 20 28 30 32 38 40 42 45

Water Speed (km/h) 12.6 10.7 11.2 9.7 8.1 8.7 6.9 5.4 3.9 4.1

5. DONATIONS Construct a scatter plot of the number of cars donated to a local charity over the pastfive years since 2007.

Years Since 2007 1 2 3 4 5Number of Cars 14 21 30 28 35

129_146_CC_A_HWPSC3_C09_662335.indd Page 129 28/07/11 8:13 AM s-60user129_146_CC_A_HWPSC3_C09_662335.indd Page 129 28/07/11 8:13 AM s-60userVolumes/110/GO00864/MIDDLE_SCHOOL_MATH/NATIONAL/ANCILLARY/ASSESSMENT_MASTERS_COURSE1-3..Volumes/110/GO00864/MIDDLE_SCHOOL_MATH/NATIONAL/ANCILLARY/ASSESSMENT_MASTERS_COURS

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.Lesson 2 Homework PracticeLines of Best Fit

1. BALLOONS Salina is having a surprise party for her friend Ernie. The table shows how many balloons she has been able to blow up by the end of each 10-minute segment.

Time (min) 10 20 30 40 50

Balloons 3 12 15 16 21

a. Construct a scatter plot of the data. Then draw and assess a line that seems to best represent the data.

b. Use the line of best fit to make a conjecture about the number of balloons she will have blown up at the end of 70 minutes.

2. COMIC BOOKS Sidney is selling his comic book collection on the Internet. The scatter plot shows how many comic books he has left at the end of each day.

a. Write an equation in slope-intercept form for the line that is drawn.

b. Use the equation to make a conjecture about the number of comic books he will have at the end of the seventh day.

3. ICE RINK Maury has an ice rink in his back yard. The scatter plot shows the thickness of the ice relative to the temperature.

a. Write an equation in slope-intercept form for the line that is drawn.

b. Use the equation to make a conjecture about the 1 −

3 inches.

Com

ic B

ooks

Lef

t2010

0

4030

8090

706050

2 4 6 81 3 5 7 9

Days

y

x

Tem

pera

ture

(°F)

-4-5-6-7-8-9

0

-3

-1-2

1 2 3Ice Thickness (in.)

y

x

Num

ber o

f Bal

loon

s

84

0

1612

3234

282420

20 40 60 8010 30 50 70 90

Time (min)

y

x


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.Lesson 3 Homework PracticeTwo-Way Tables

For Exercises 1-6, use the Venn diagram at the right and the information below.

The Venn diagram compares the roller coasters at anamusement park as to whether or not they are made of steel and whether or not they have loops.

1. Complete the two-way table below. 2. How many roller coasters are at the

Steel Not Steel TotalLoops

No Loops

Total

amusement park?

3. Find the relative frequencies from the 4. Interpret the relative frequencies youtable in Exercise 1 by row. found in Exercise 3.

Steel Not Steel Total

Loops 6 −−

10 = 0.60

No Loops

5. Find the relative frequencies from the 6. Interpret the relative frequencies youtable in Exercise 1 by column. Round to found in Exercise 5.the nearest hundredth if necessary.

Steel Not Steel

Loops 6 −

8 = 0.75

No Loops

Total

LoopsSteel

2 4 26


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.Lesson 4 Homework PracticeDescriptive Statistics

For Exercises 1 and 2, find the mean, median, mode, and range of each data set. Round to the nearest tenth if necessary.

1. The ages, in years, of the students in an art class: 23, 21, 19, 23, 24, 17, 15

2. The number of text messages sent in a week: 39, 41, 30, 14, 45, 40, 48, 39, 40, 35

For Exercises 3 and 4, find the five-number summary of each set of data. Draw a box plot of the data.

3. The ages, in years, of the residents of a retirement community are shown in the table.

4. The weekly amounts, in dollars, in a bank account are 169, 163, 153, 166, 149, 148, 146, 145, 152, 163, and 152.

5. What is a conclusion that can be drawn from the box plot for Exercise 4?

Ages in Years86 83 98 99 8186 95 84 79 90


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.Lesson 5 Homework PracticeMeasures of Variation

For Exercises 1 and 2, find the mean absolute deviation of each set of data. Round to the nearest tenth if necessary. Describe what the mean absolute deviation represents.

1. Exercise Time (min)45

1006075

7590

90105

2. Food Items Donated3844

4647

5255

3. Refer to the table in Exercise 1. The standard deviation is about 20.4 minutes. Describe the data values that are within one standard deviation of the mean.

4. The table shows the selling prices of various laptops at two electronic stores.

a. Find the mean absolute deviation for each set of data. Round to the nearest hundredth.

b. Write a sentence comparing their variation.

Tablet Prices ($)

Crazy for Computers

Keyboard Kings

150 500

200 550

500 650

800 850

1,000 900

1,200 1,100


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.Lesson 6 Homework PracticeAnalyze Data Distributions

1. CARNIVALS The number of people that attended the carnival each year is shown in the graph at the right.

a. Describe the shape of the distribution. Identify any clusters, gaps, peaks, or outliers.

b. Describe the center and spread of the distribution. Justify your response based on the shape of the distribution.

2. APPLES Mr. Kelly’s homeroom went apple picking. The line plot shows the number of pounds of applesthat were collected.

a. Describe the shape of the distribution. Identifyany clusters, gaps, peaks, or outliers.

b. Describe the center and spread of the distribution.Justify your response based on the shape of thedistribution.

3. TEMPERATURE The line plot shows the hightemperatures for various days through the summer.

a. Describe the shape of the distribution. Identifyany clusters, gaps, peaks, or outliers.

b. Describe the center and spread of the distribution.Justify your response based on the shape of thedistribution.

17 18 19 20 21 22 23 24

×

×

×

×

×

×× ×

×

Number of Pounds

of Apples Picked

97 98 99 100 101 102

×

×

×

×

×

×

×

×

×

××

High Temperatures

2013201220112010

20

10

0

Atte

ndan

ce (t

hous

ands

)

40

30

Year

27 29

1316

Carnival Attendance


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NAME DATE PERIOD Lesson 1 Homework Practice -...

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