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Chapter 11 Skills Practice • 777
Floor Plans and TilesRandom Sampling
VocabularyDefine the term in your own words.
1. dot plot
Problem SetSample Class Data from Mr. Puckett’s Math class is shown. Use the data and the Random
Number Table at the end of Chapter 11 when necessary to answer each question.
Mr. Puckett’s Math Class
Student Number
Student Name
GenderNumber of
SiblingsNumber of
Pets
11 Anna F 1 3
12 Jerome M 0 0
13 Andrew M 1 1
14 Mei F 0 4
15 Gene M 0 0
16 Laura F 5 4
17 Horace M 0 1
18 Augustine F 2 3
19 Beatrice F 1 2
Lesson 11.3 Skills Practice
Name ________________________________________________________ Date _________________________
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778 • Chapter 11 Skills Practice
Mr. Puckett’s Math Class
Student Number
Student Name
GenderNumber of
SiblingsNumber of
Pets
20 Fernando M 0 1
21 Quentin M 1 3
22 Rika F 1 6
23 Violet F 3 3
24 Terrence M 1 6
25 Nathan M 2 3
26 Jasmine F 0 1
27 Ramona F 0 2
28 Phillip M 1 0
29 Alicia F 3 4
30 Douglas M 2 7
1. Mr. Puckett wants to know the mean number of siblings his students have. He chooses the
students with student numbers 11 through 15 as his sample. Determine the mean number of
siblings for the students in this sample.
Themeannumberofsiblingsis2__5
or0.4basedonthesample.
2. Select a random sample of 5 students using a Random Number Table or random number
generator. Determine the mean number of siblings for the students in your sample.
Lesson 11.3 Skills Practice page 2
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Chapter 11 Skills Practice • 779
3. Determine the actual mean number of siblings for the 20 students in Mr. Puckett’s class.
4. Mr. Puckett wants to know the mean number of pets his students have. He chooses the first
5 students to voluntarily raise their hands as his sample. The students selected are Laura,
Augustine, Rika, Terrence, and Nathan. Determine the mean number of pets for the students
in this sample.
5. Select a random sample of 5 students using a Random Number Table or random number
generator. Determine the mean number of pets for the students in your sample.
6. Determine the actual mean number of pets for the 20 students in Mr. Puckett’s class.
Lesson 11.3 Skills Practice page 3
Name ________________________________________________________ Date _________________________
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780 • Chapter 11 Skills Practice
Lesson 11.3 Skills Practice page 4
The Employee Roster of Fish & Chips Seafood Buffet is shown. Use the table and the Random Number
Table at the end of Chapter 11 when necessary to answer each question.
Employee Roster of Fish & Chips Seafood Buffet
Employee Number
Employee Name
PositionYears of
ExperienceMiles Driven to
Work Daily
51 Ralph Cook 1 12
52 Betty Cashier 2 5
53 Liang Manager 10 8
54 Steve Cook 1 15
55 Cheryl Cashier 2 25
56 Bart Cashier 3 20
57 Ulysses Cook 2 14
58 Wilma Cook 4 11
59 Jerry Manager 8 8
60 Sabrina Cook 1 12
61 Althea Manager 7 13
62 Tiffany Cook 2 15
63 Meredith Cashier 1 4
64 Gregory Cook 4 9
65 Patricia Cashier 3 16
66 Bob Manager 12 30
67 Ignatius Cook 5 22
68 Xavier Cashier 3 19
69 Linda Manager 9 7
70 Howard Cook 2 6
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Chapter 11 Skills Practice • 781
Lesson 11.3 Skills Practice page 5
Name ________________________________________________________ Date _________________________
7. Ms. Gibson, the owner of Fish & Chips Seafood Buffet, wants to determine the mean number of
miles driven to work by her employees. She surveys the first 5 employees to arrive at work today.
The employees selected are Cheryl, Bart, Tiffany, Patricia, and Bob. Determine the mean number
of miles driven to work daily by the employees in the sample.
Themeannumberofmilesdriventoworkis106____5
or21.2milesbasedonthesample.
8. Select a random sample of 5 employees using a Random Number Table or random number
generator. Determine the mean number of miles driven to work daily based on your sample.
9. Determine the actual mean number of miles driven to work daily for the 20 employees.
10. Ms. Gibson wants to determine the mean years of experience of her employees. At the managers’
meeting, she surveys each of the managers. Determine the mean years of experience of the
employees based on Ms. Gibson’s sample.
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782 • Chapter 11 Skills Practice
Lesson 11.3 Skills Practice page 6
11. Select a random sample of 5 employees using a Random Number Table or random number
generator. Determine the mean years of experience for the employees in your sample.
12. Determine the actual mean years of experience for the 20 employees.
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Chapter 11 Skills Practice • 783
What Does the Data Mean?Using Samples, Centers, and Spreads to Describe Data
VocabularyWrite the term(s) or phrase from the box that best completes each statement.
variability spread range
meanabsolutedeviation deviationfromthemean
1. The of data describes how “spread out” the data is. This can also be
described as the of data.
2. The is the average of the absolute values of the deviations of each data
value from the mean.
3. The is calculated by subtracting the mean from each data value in a
sample.
4. The of data refers to the minimum and maximum values in a data set.
Lesson 11.4 Skills Practice
Name ________________________________________________________ Date _________________________
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784 • Chapter 11 Skills Practice
Lesson 11.4 Skills Practice page 2
Problem SetComplete the table. First calculate the mean of the data. Then for each data value, calculate the
deviation from the mean and the absolute value of each deviation. Finally, calculate the mean
absolute deviation.
1.Data Mean
Deviation From the Mean
Absolute Value of the Deviation From the Mean
35
41
35241526 6
18 182415223 23
58 58241517 17
65 65241524 24
29 292415212 12
Mean Absolute Deviation 16.4
Mean535118158165129_______________________5
MeanAbsoluteDeviation56123117124112______________________5
5 205____5 5 82___5
5 41 5 16.4
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Chapter 11 Skills Practice • 785
2.Data Mean
Deviation From the Mean
Absolute Value of the Deviation From the Mean
19
26
45
73
27
Mean Absolute Deviation
3.Data Mean
Deviation From the Mean
Absolute Value of the Deviation From the Mean
61
55
57
64
86
Mean Absolute Deviation
Lesson 11.4 Skills Practice page 3
Name ________________________________________________________ Date _________________________
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786 • Chapter 11 Skills Practice
Lesson 11.4 Skills Practice page 4
4.
Data MeanDeviation From
the MeanAbsolute Value of the
Deviation From the Mean
62
49
9
92
15
Mean Absolute Deviation
5.
Data MeanDeviation From
the MeanAbsolute Value of the
Deviation From the Mean
24
21
66
34
44
Mean Absolute Deviation
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Chapter 11 Skills Practice • 787
Lesson 11.4 Skills Practice page 5
Name ________________________________________________________ Date _________________________
6.
Data MeanDeviation From
the MeanAbsolute Value of the
Deviation From the Mean
59
13
83
95
42
Mean Absolute Deviation
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788 • Chapter 11 Skills Practice
Lesson 11.4 Skills Practice page 6
Calculate the five number summary and the Interquartile Range for the data set.
7. Data Set: 16, 97, 59, 54, 28
Datainascendingorder:16,28,54,59,97
Minimum516 Firstquartile:16,28
Q1516128________2
5 22
Thirdquartile:59,97
Q3559197________2
5 78
IQR5 78222
5 56
Maximum597
Median554
8. Data Set: 29, 47, 85, 96, 52
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Chapter 11 Skills Practice • 789
Lesson 11.4 Skills Practice page 7
Name ________________________________________________________ Date _________________________
9. Data Set: 29, 62, 16, 65, 83, 62, 96, 61
10. Data Set: 78, 13, 79, 87, 68, 4, 68, 98
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790 • Chapter 11 Skills Practice
Lesson 11.4 Skills Practice page 8
11. Data Set: 96, 15, 59, 50, 9, 27, 42, 97, 29
12. Data Set: 12, 63, 97, 52, 91, 71, 2
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Chapter 11 Skills Practice • 791
Lesson 11.4 Skills Practice page 9
Name ________________________________________________________ Date _________________________
Construct a box-and-whisker plot for the five number summary.
13. Minimum 5 16, Q1 5 22, Median 5 54, Q3 5 78, Maximum 5 97
0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300
14. Minimum 5 129, Q1 5 138, Median 5 152, Q3 5 190.5, Maximum 5 196
0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300
15. Minimum 5 16, Q1 5 45, Median 5 62, Q3 5 174, Maximum 5 196
0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300
16. Minimum 5 4, Q1 5 140.5, Median 5 173, Q3 5 183, Maximum 5 198
0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300
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792 • Chapter 11 Skills Practice
Lesson 11.4 Skills Practice page 10
17. Minimum 5 9, Q1 5 21, Median 5 42, Q3 5 77.5, Maximum 5 97
0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300
18. Minimum 5 2, Q1 5 112, Median 5 163, Q3 5 191, Maximum 5 197
0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300
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Chapter 11 Skills Practice • 793
Lesson 11.5 Skills Practice
Name ________________________________________________________ Date _________________________
Taking a SurveyUsing Sample Size
VocabularyWrite a definition for the following term in your own words.
1. sample size
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794 • Chapter 11 Skills Practice
Lesson 11.5 Skills Practice page 2
Problem SetMr. Helton gives a survey to the 20 students in his U.S. History class. Use the results of the survey and
the Random Number Table at the end of Chapter 11 to answer each question.
Student Number
Student NameHours Spent
Online per WeekHours Spent
Watching TV per Week
20 Hyacinth 14 10
21 Daniel 10 12
22 Gloria 7 15
23 June 0 14
24 Hector 8 5
25 Jill 14 3
26 Hannah 0 9
27 Scott 20 10
28 Emily 5 20
29 Iris 10 0
30 Juan 10 10
31 Brian 25 4
32 Tabitha 0 5
33 Jamal 14 14
34 Laura 11 10
35 Grant 5 5
36 Joelle 15 5
37 Brad 7 14
38 Tony 5 20
39 Naomi 20 10
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Chapter 11 Skills Practice • 795
Lesson 11.5 Skills Practice page 3
Name ________________________________________________________ Date _________________________
1. Select 2 students from Mr. Helton’s class using the Random Number Table at the end of
Chapter 11. Determine the mean number of hours spent online weekly for the 2 students in
your random sample.
Answerswillvary.
IusedLine1oftheRandomNumberTabletoselectEmily(5 hours)andJuan(10hours).
Themeannumberofhoursspentonlineweeklyis15___2
or7.5hoursforthissample.
2. Select 5 students from Mr. Helton’s class using a different line in the Random Number Table.
Determine the mean number of hours spent online weekly for the 5 students in your random
sample.
3. Select 8 students from Mr. Helton’s class using a different line in the Random Number Table.
When using the Random Number Table, it may be necessary to use more than one line to select
8 students. Determine the mean number of hours spent online weekly for the 8 students in your
random sample.
4. Determine the actual mean number of hours spent online weekly for the 20 students in the class.
Discuss how the means changed as the random sample size increased.
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796 • Chapter 11 Skills Practice
Lesson 11.5 Skills Practice page 4
5. Select 2 students from Mr. Helton’s class using the Random Number Table. Determine the mean
number of hours spent watching television weekly for the 2 students in your random sample.
6. Select 5 students from Mr. Helton’s class using a different line in the Random Number Table.
Determine the mean number of hours spent watching television weekly for the 5 students in your
random sample.
7. Select 8 students from Mr. Helton’s class using a different line in the Random Number Table.
Determine the mean number of hours spent watching television weekly for the 8 students in your
random sample.
8. Determine the actual mean number of hours spent watching television weekly for the 20 students
in the class. Discuss how the means changed as the random sample size increased.
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Chapter 11 Skills Practice • 797
Lesson 11.5 Skills Practice page 5
Name ________________________________________________________ Date _________________________
Julie is writing a paper for her college statistics course. She gives surveys to 20 adults at a Board of
Education meeting. Use the information listed in the table to answer the question.
ID Number NameNumber of Automobiles
Owned in Your LifeNumber of Homes Owned in Your Life
40 Charlie 5 3
41 Lonnie 2 1
42 Belinda 4 0
43 Rafael 3 2
44 Thomas 8 1
45 Marla 2 2
46 Carlota 4 4
47 Ernest 7 0
48 Mike 2 3
49 Beverly 3 4
50 Quincy 6 2
51 Marcus 7 0
52 Maeko 7 2
53 Allison 2 0
54 Rosa 3 1
55 Adrian 5 4
56 Kayla 2 2
57 Robert 6 3
58 Diane 3 5
59 Jack 5 2
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798 • Chapter 11 Skills Practice
Lesson 11.5 Skills Practice page 6
9. Select 2 people from Julie’s study using the Random Number Table. Determine the mean number
of automobiles owned for the 2 people in your random sample.
Answerswillvary.
IusedLine10ofthetabletoselectErnest(7automobiles)andMaeko(7automobiles).
Themeannumberofautomobilesownedis14___2
or7automobilesforthissample.
10. Select 5 people from Julie’s study using a different line in the Random Number Table. Determine
the mean number of automobiles owned for the 5 people in your random sample.
11. Select 8 people from Julie’s study using a different line in the Random Number Table. Determine
the mean number of automobiles owned for the 8 people in your random sample.
12. Determine the actual mean number of automobiles owned for the 20 people in the study. Discuss
how the means changed as the random sample size increased.
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Chapter 11 Skills Practice • 799
Lesson 11.5 Skills Practice page 7
Name ________________________________________________________ Date _________________________
13. Select 2 people from Julie’s study using the Random Number Table. Determine the mean number
of homes owned for the 2 people in your random sample.
14. Select 5 people from Julie’s study using a different line in the Random Number Table. Determine
the mean number of homes owned for the 5 people in your random sample.
15. Select 8 people from Julie’s study using a different line in the Random Number Table. Determine
the mean number of homes owned for the 8 people in your random sample.
16. Determine the actual mean number of homes owned for the 20 people in the study. Discuss how
the means changed as the random sample size increased.
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800 • Chapter 11 Skills Practice
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Chapter 12 Skills Practice • 801
A Picture is Worth a Thousand WordsBar Graphs
VocabularyExplain the similarities and differences between each term.
1. Bar graph, double bar graph, and stacked bar graph
Lesson 12.1 Skills Practice
Name ________________________________________________________ Date _________________________
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802 • Chapter 12 Skills Practice
Lesson 12.1 Skills Practice page 2
Problem SetAnalyze the given graph to answer each problem.
1. The bar graph shows the number of ice cream cones sold each month at Jen and Barry’s Ice
Cream Parlor.
June
400
200
600
800
1000
1200
1400
1600
1800
Monthly Ice Cream Cone Salesat Jen and Barry’s
x
y
July
Aug
ust
Sep
tem
ber
Oct
ober
Nov
emb
er
Month
Num
ber
of
Ice
Cre
am C
one
s
a. In which of the six months did Jen and Barry’s Ice Cream Parlor sell the fewest ice cream
cones? How many did they sell in that month?
In November they sold 650 cones.
b. In which of the six months did Jen and Barry’s Ice Cream Parlor sell the most ice cream cones?
How many did they sell in that month?
In August they sold 1350 cones.
c. How many total ice cream cones did Jen and Barry’s Ice Cream Parlor sell during the six month
period represented in the graph?
They sold a total of 5950 cones.
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Chapter 12 Skills Practice • 803
Lesson 12.1 Skills Practice page 3
Name ________________________________________________________ Date _________________________
2. On a recent trip to a beach in southern Florida, five friends competed to see who could find the
most sharks’ teeth. Their results are displayed in the bar graph.
Keith
Sarah
Caleb
Sam
GeraldineN
ame
12 14 16 18Number of Sharks’ Teeth Found
x
y
20 4 6 8 10
a. Who found the most sharks’ teeth? How many teeth did that person find?
b. How many total sharks’ teeth did the five friends find?
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804 • Chapter 12 Skills Practice
Lesson 12.1 Skills Practice page 4
3. The double bar graph shows the scores of the five starters on the girls’ basketball team for their
Tuesday and Friday games.
Katelyn Jin Nora Brooke KianaPlayer Name
x
y Points Scored Tuesday and Friday
0
2
4
6
8
10
12
14
16
18
Po
ints
Sco
red
TuesdayFriday
a. Which player scored fewer points during Friday’s game than she did during Tuesday’s game?
b. Which player scored the most total points during the two games? How many points did that
player score?
c. Determine the average number of points scored by the five starters during Friday’s game.
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Chapter 12 Skills Practice • 805
Lesson 12.1 Skills Practice page 5
Name ________________________________________________________ Date _________________________
4. Four students participated in a Walk-a-Thon to raise money for a charity. The distances each
student walked on Saturday and Sunday are displayed in the stacked bar graph.
Miles Walked at the Walk-a-Thon
4
0
8
12
16
20
24
28
32
36M
iles
Wal
ked
Charlie Lisa Isaiah TabithaName
x
y
SundaySaturday
a. Who walked the most miles on Saturday? How many miles did that person walk on Saturday?
b. Who walked the most total miles during the Walk-a-Thon? How many total miles did that
person walk?
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806 • Chapter 12 Skills Practice
Lesson 12.1 Skills Practice page 6
5. The bar graph represents the number of gold medals won by 5 countries at the 2008 Summer
Olympics.
4
2
6
8
10
12
14
16
18
Gold Medals Won at the2008 Olympics
Country
Num
ber
of
Go
ld M
edal
s
x
y
Gre
at B
ritai
n
Ger
man
y
Aus
tral
ia
Sou
th K
orea
Italy
a. Which country won 13 gold medals at the 2008 Summer Olympics?
b. How many more gold medals did Germany win than Italy at the 2008 Summer Olympics?
c. How many gold medals did Great Britain win at the 2008 Summer Olympics?
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Chapter 12 Skills Practice • 807
6. The bar graph represents the number of different car models available at each car lot.
0 10 20 30 40 50 60
Car Universe
Number of Car Models atDifferent Car Lots
Number of Car Models
Car
Lo
t
x
y
Car Planet
Car Galaxy
Car Nation
a. Which car lot has 25 different car models?
b. What is the difference between the car lot with the most car models and the car lot with the
least car models?
Lesson 12.1 Skills Practice page 7
Name ________________________________________________________ Date _________________________
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808 • Chapter 12 Skills Practice
Lesson 12.1 Skills Practice page 8
7. Create a single bar graph to display the scores of five students on a recent math quiz. Clayton
scored 18; Reginald scored 14; Ernestine scored 16; Maria scored 20; and Shawna scored 15.
2020 4 6 8 10 12 14 16 18
Math Quiz Scores
Scores of Five Students on a Math Quiz
x
y
Clayton
Reginald
Ernestine
Maria
Shawna
Nam
e
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Chapter 12 Skills Practice • 809
Lesson 12.1 Skills Practice page 9
Name ________________________________________________________ Date _________________________
8. Create a single bar graph to display the number of pets owned by each of the following students.
Aretha has 4 pets; Edward has 7 pets; Franco has 3 pets; and Patty has 5 pets.
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810 • Chapter 12 Skills Practice
Lesson 12.1 Skills Practice page 10
9. Create a double bar graph that displays the number of hours spent watching television during the
weekdays and during the weekend for five students last week.
NameNumber of Hours Watching TV During the Weekdays
Number of Hours Watching TV During the Weekend
Sonya 12 6
Terrence 14 4
Will 6 0
Christine 8 3
Larry 10 5
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Chapter 12 Skills Practice • 811
Lesson 12.1 Skills Practice page 11
Name ________________________________________________________ Date _________________________
10. Create a stacked bar graph that displays the number of hours spent watching television during the
weekdays and during the weekend for five students last week.
NameNumber of Hours Watching TV During the Weekdays
Number of Hours Watching TV During the Weekend
Sonya 12 6
Terrence 14 4
Will 6 0
Christine 8 3
Larry 10 5
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812 • Chapter 12 Skills Practice
Lesson 12.1 Skills Practice page 12
11. Create a double bar graph to display the results of the prom theme vote.
Prom ThemeNumber of Junior
VotesNumber of Senior
Votes
Outer Space Romance 20 25
Texas Rodeo 30 35
Enchanted Ball 10 20
A Night in the 60s 15 25
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Chapter 12 Skills Practice • 813
12. Create a stacked bar graph to display the results of the prom theme vote.
Prom ThemeNumber of Junior
VotesNumber of Senior
Votes
Outer Space Romance 20 25
Texas Rodeo 30 35
Enchanted Ball 10 20
A Night in the 60s 15 25
Lesson 12.1 Skills Practice page 13
Name ________________________________________________________ Date _________________________
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Chapter 12 Skills Practice • 829
Can Podcasts Affect Ratings?Comparing Measures of Center of Two Populations
Problem SetUse lines 10–13 of the random number table to select random samples from a data set of 50 middle
school students.
Line 10 29478 59652 50414 31966 87912 87154 12944 49862 96566 48825
Line 11 96155 95009 27429 72918 08457 78134 48407 26061 58754 05326
Line 12 29621 66583 62966 12468 20245 14015 04014 35713 03980 03024
Line 13 12639 75291 71020 17265 41598 64074 64629 63293 53307 48766
1. Choose a random sample of 6 students from Line 10. Assign students 2-digit numbers 50–99.
85, 96, 52, 50, 66, 87
2. Choose a random sample of 7 students from Line 12. Assign students 2-digit numbers 20–79.
3. Choose a random sample of 6 students from Line 13. Assign students 2-digit numbers 45–94.
4. Choose a random sample of 5 students from Lines 10–11. Assign students 3-digit
numbers 250–299.
5. Choose a random sample of 5 students from Lines 12–13. Assign students 3-digit
numbers 250–349.
6. Choose a random sample of 6 students from Lines 10–13. Assign students 4-digit numbers
9000–9999
Lesson 12.3 Skills Practice
Name ________________________________________________________ Date _________________________
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830 • Chapter 12 Skills Practice
Lesson 12.3 Skills Practice page 2
Display the data from each table in either a back-to-back stem-and-leaf plot or two line plots using the
same scale. Describe the distribution of the data.
7. Create a back-to-back stem-and-leaf plot from the data in the table showing students’ sales of two
different fund-raising items.
Raffle Tickets Sold
Candy Bars Sold
23 9
15 8
35 0
28 12
30 15
11 5
30 3
32 30
8 20
27 12
8 51 8735200
0358922500
0123
1|2 = 12
Fund-raising Items Sold
Raf�e TicketsSold
Candy BarsSold
The data for raffle tickets is skewed left and the data for candy bars is skewed right.
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Chapter 12 Skills Practice • 831
Lesson 12.3 Skills Practice page 3
Name ________________________________________________________ Date _________________________
8. Create two line plots using the same scale from the data in the table showing two friends’ weekly
volunteer hours.
Luke Kylie
5 5
9 6
8 3
9 4
7 6
8 5
9 8
9 9
6 6
8 7
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832 • Chapter 12 Skills Practice
Lesson 12.3 Skills Practice page 4
9. Create a back-to-back stem-and-leaf plot from the data in the table showing students’ math test
scores from two different classrooms.
Ms. Kinzer Mr. Hannon
85 88
78 90
77 93
90 84
91 85
93 92
76 95
91 90
79 79
86 89
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Chapter 12 Skills Practice • 833
Lesson 12.3 Skills Practice page 5
Name ________________________________________________________ Date _________________________
10. Create two line plots using the same scale from the data in the table showing the amount of money
each sibling spent per week.
Julio Linda
10 18
6 15
15 16
9 17
12 10
5 13
10 17
11 18
10 17
7 9
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834 • Chapter 12 Skills Practice
Lesson 12.3 Skills Practice page 6
11. Create two line plots using the same scale from the data in the table showing cars sold per month
by two different salespeople.
Salesperson A Salesperson B
18 5
10 6
9 4
12 10
17 9
18 7
20 6
14 6
18 2
17 5
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Chapter 12 Skills Practice • 835
Lesson 12.3 Skills Practice page 7
Name ________________________________________________________ Date _________________________
12. Create a back-to-back stem-and-leaf plot from the data in the table showing daily temperature in
degrees Fahrenheit for two cities.
Sunnyville Cooltown
68 72
70 69
75 63
80 58
76 70
75 50
77 63
69 52
75 54
81 53
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836 • Chapter 12 Skills Practice
Lesson 12.3 Skills Practice page 8
Tell whether the mean or median is the best measure of center for the data shown in each. Explain why.
13. median (skewed left) 14.
0 5 10
X X XX
XX
XXXX
5230125051
01234
2|0 = 20
15. 16.
001235531
5678
0 5 10 15 20
XX XXXXX
XXX
XX
17. 18.
0 5 10
X X XXX
XX
XXX
0 5 10
XXX
X X XXXXX
10 5420 99311
24011301228
2345
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Chapter 12 Skills Practice • 837
Finding Your Spot to LiveDrawing Conclusions about Two Populations
Problem SetDescribe the distribution and variation of each graphical display of data.
1.
0 5 10
XXXX
XX
XX
0 5 10
X X XX
X X XX
Both sets of data are symmetric.
2. 8 542 6430
01340251
01234
2|1 = 21
3.
5 10 15 20 2500
10
20
30
40
50
5 10 15 20 2500
10
20
30
40
50
Lesson 12.4 Skills Practice
Name ________________________________________________________ Date _________________________
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838 • Chapter 12 Skills Practice
Lesson 12.4 Skills Practice page 2
4.
50 60 70 80 90 100
X X XX
XX
X
50 60 70 80 90 100
X X XX
XX
X
5. 0 965 751 0
83800000
789
9|0 = 90
10
6.
10 20 30 40 5000
20
40
60
80
100
10 20 30 40 5000
20
40
60
80
100
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Chapter 12 Skills Practice • 839
Lesson 12.4 Skills Practice page 3
Name ________________________________________________________ Date _________________________
Use the five number summaries to create box-and-whisker plots for both data sets in each along the
same number line.
7.Minimum 4 1
Q1 6 3
Median 8 4
Q3 10 7
Maximum 12 15
IQR 4 4
0 5 10 15 20
8.Minimum 0 3
Q1 10 8
Median 15 10
Q3 17 11
Maximum 20 17
IQR 7 3
9.Minimum 25 10
Q1 35 20
Median 40 25
Q3 45 45
Maximum 50 50
IQR 10 25
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840 • Chapter 12 Skills Practice
Lesson 12.4 Skills Practice page 4
10.Minimum 1 5
Q1 2 7
Median 3 10
Q3 4 13
Maximum 11 18
IQR 2 6
11.Minimum 0 0
Q1 15 5
Median 35 10
Q3 37 12
Maximum 40 25
IQR 22 7
12.Minimum 40 10
Q1 60 40
Median 70 70
Q3 80 80
Maximum 100 100
IQR 20 40
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Chapter 12 Skills Practice • 841
Lesson 12.4 Skills Practice page 5
Name ________________________________________________________ Date _________________________
Compare the box-and-whisker plots in each and describe the variation.
13.
0 10
The data on the bottom is symmetric and the
data on top is skewed right.
14.
0 50
15.
0 20
16.
0 100
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842 • Chapter 12 Skills Practice
Lesson 12.4 Skills Practice page 6
17.
0 10
18.
0 50
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