SCENARIO 1-1
The manager of the customer service division of a major consumer electronics company is interested
in determining whether the customers who have purchased a Blu-ray player made by the company
over the past 12 months are satisfied with their products.
SCENARIO 1-2
A Wall Street Journal poll asked 2,150 adults in the U.S. a series of questions to find out their view
on the U.S. economy.
Scenarios 1-3,
SCENARIO 1-3
The manager of the customer service division of a major consumer electronics company is interested
in determining whether the customers who have purchased a Blu-ray player made by the company
over the past 12 months are satisfied with their products.
SCENARIO 2-1
An insurance company evaluates many numerical variables about a person before deciding on an
appropriate rate for automobile insurance. A representative from a local insurance agency selected a
random sample of insured drivers and recorded, X, the number of claims each made in the last 3
years, with the following results.
X f
1 14
2 18
3 12
4 5
5 1
SCENARIO 2-2
taken to determine the number of employees the officers supervise in the operation of their
departments, where X is the number of employees overseen by each information systems officer.
X f_
1 7
2 5
3 11
4 8
5 9
SCENARIO 2-3
Every spring semester, the School of Business coordinates a luncheon with local business leaders for
graduating seniors, their families, and friends. Corporate sponsorship pays for the lunches of each of
the seniors, but students must purchase tickets to cover the cost of lunches served to guests they bring
with them. The following histogram represents the attendance at the senior luncheon, where X is the
number of guests each graduating senior invited to the luncheon and f is the number of graduating
seniors in each category.
17
152
85
18
3 0
0
20
40
60
80
100
120
140
160
0 1
SCENARIO 2-4
A survey was conducted to determine how people rated the quality of programming available on
television. Respondents were asked to rate the overall quality from 0 (no quality at all) to 100
(extremely good quality). The stem-and-leaf display of the data is shown below.
Stem Leaves
3 24
4 03478999
5 0112345
6 12566
7 01
8
9 2
Scenarios 2-5,
SCENARIO 2-5
The following are the duration in minutes of a sample of long-distance phone calls made within the
continental United States reported by one long-distance carrier.
Relative
Time (in Minutes) Frequency
0 but less than 5 0.37
5 but less than 10 0.22
10 but less than 15 0.15
15 but less than 20 0.10
20 but less than 25 0.07
25 but less than 30 0.07
30 or more 0.02
SCENARIO 2-6
A sample of 200 students at a Big-Ten university was taken after the midterm to ask them whether
they went bar hopping the weekend before the midterm or spent the weekend studying, and whether
they did well or poorly on the midterm. The following table contains the result.
Did Well in Midterm Did Poorly in Midterm
Studying for Exam 80 20
Went Bar Hopping 30 70
Scenarios 2-7,
SCENARIO 2-7
The Stem-and-Leaf display below contains data on the number of months between the date a civil suit
is filed and when the case is actually adjudicated for 50 cases heard in superior court.
Stem Leaves
1 2 3 4 4 4 7 8 9 9
2 2 2 2 2 3 4 5 5 6 7 8 8 8 9
3 0 0 1 1 1 3 5 7 7 8
4 0 2 3 4 5 5 7 9
5 1 1 2 4 6 6
6 1 5 8
Scenarios 2-8,
SCENARIO 2-8
The Stem-and-Leaf display represents the number of times in a year that a random sample of 100
“lifetime” members of a health club actually visited the facility.
Stem Leaves
0 012222233333344566666667789999
1 1111222234444455669999
2 00011223455556889
3 0000446799
4 011345567
5 0077
6 8
7 67
8 3
9 0247
SCENARIO 2-9
The frequency distribution below represents the rents of 250 randomly selected federally subsidized
apartments in a small town.
Rent in $ Frequency
1,100 but less than 1,200 113
1,200 but less than 1,300 85
1,300 but less than 1,400 32
1,400 but less than 1,500 16
1,500 but less than 1,600 4
SCENARIO 2-10
The histogram below represents scores achieved by 200 job applicants on a personality profile.
0.10
0.20 0.20
0.10
0.20
0.10 0.10
0.00
0.10
0.20
0.30
0 10 20 30 40 50 60 70
Scenarios 2-11,
SCENARIO 2-11
The ordered array below resulted from selecting a sample of 25 batches of 500 computer chips and
determining how many in each batch were defective.
Defects
1 2 4 4 5 5 6 7 9 9 12 12 15
17 20 21 23 23 25 26 27 27 28 29 29
Scenarios 2-12
SCENARIO 2-12
The table below contains the opinions of a sample of 200 people broken down by gender about the
latest congressional plan to eliminate anti-trust exemptions for professional baseball.
For Neutral Against Totals
Female 38 54 12 104
Male 12 36 48 96
Totals 50 90 60 200
SCENARIO 2-13
Given below is the stem-and-leaf display representing the amount of detergent used in gallons (with
leaves in 10ths of gallons) in a day by 25 drive-through car wash operations in Phoenix.
9 | 147
10 | 02238
11 | 135566777
12 | 223489
13 | 02
SCENARIO 2-14
The table below contains the number of people who own a portable Blu-ray player in a sample of 600
broken down by gender.
Own a Portable
Blu-ray player Male Female
Yes 96 40
No 224 240
SCENARIO 2-18
The stem-and-leaf display below shows the result of a survey on 50 students on their satisfaction with
their school with the higher scores represent higher level of satisfaction.
Stem-and-Leaf Display
Stem unit 10
Statistics 4 1 3 6 6 7
Sample Size 50 5 0 0 3 8 9
Mean 71.06 6 0 1 1 4 4 5 7 7 9 9
Median 73.5 7 0 0 0 1 3 4 4 5 5 6 6 6 7 8 8
Std. Deviation 14.13695 8 0 1 1 3 4 4 5 7 7 8 9
Minimum 41 9 0 2 2 7
Maximum 97
