Chapter 2: Graphs, Charts, and Tables--Describing Your Data

70 CHAPTER 2 • GRAPHS, CHARTS, AND TABLES—DESCRIBING YOUR DATA
of 28 drive-thru times was recently taken and is
shown here.
Speed of Service (time in seconds)
83 138 145 147
130 79 156 156
90 85 68 93
178 76 73 119
92 146 88 103
116 134 162 71
181 110 105 74
a. Construct a stem and leaf diagram of the speed
of service times.
b. What range of time might the restaurant say is
the most frequent speed of service?
2-38. A random sample of 30 customer records for a
physician’s office showed the following time (in
days) to collect insurance payments:
Number of Days to Collect Payment
34 55 36 39 36
32 35 30 47 31
60 66 48 43 33
24 37 38 65 35
22 45 33 29 41
38 35 28 56 56
a. Construct a stem and leaf diagram of these data.
b. Within what range of days are most payments
collected?
2-39. USA Today presented data (Marilyn Adams and
Dan Reed, “Difficult times battered airlines,”
September 16, 2005) to show that major airlines
accounting for more than half of capacity were
expected to be in bankruptcy court. The total
seat capacity of major airlines was 858 billion
at the time. For airlines expected to be in
bankruptcy court, the following data were
presented:
2004 airline seat capacity (in billions)
Airline United Delta Northwest U.S. Airways ATA
Capacity 145 130 92 54 21
a. Construct a bar graph representing the contribution
to the total seat capacity of the major airlines
for the five airlines indicated.
b. Produce a pie chart exhibiting the percentage of
the total seat capacity for the five major airlines
expected to be in bankruptcy court and the combined
capacity of all others.
c. Calculate the percent of the capacity of the airlines
expected to be in bankruptcy court. Was
USA Today correct in the percentage stated?
2-40. The NPD Group provides global sales and marketing
information that helps clients make more
informed, fact-based decisions in order to optimize
their businesses. Many of the world’s most successful
companies rely on them for insight on what
is selling, where, and why so that they can understand
and leverage the latest trends. They recently
(July 2005) released the following results of a survey
intended to determine the market share distribution
for the major corporations that make digital
music devices:
Creative
Corporation Apple SanDisk Technology iRiver Samsung
Market Share 74% 6.4% 3.9% 3.6% 2.6%
a. Generate a bar chart to display these data.
b. Generate a pie chart to display these data.
c. Which of the two displays most effectively presents
the data? Explain your answer.
Computer Database Exercises
2-41. The manager for Capital Educators Federal Credit
Union has selected a random sample of 300 of the
credit union’s credit card customers. The data are
in a file called Capital. The manager is interested
in graphically displaying the percentage of card
holders of each gender.
a. Determine the appropriate type of graph to use
in this application.
b. Construct the graph and interpret it.
2-42. Amazon.com celebrated its 10th anniversary in
July 2005. Its growth can seen by examining its
increasing sales volume (in $billions) and the net
income/loss during Amazon’s 10 years of existence
as reported in USA Today (“Amazon CEO
takes long view,” September 6, 2005). A file entitled
AMAZON contains these data.
a. Construct one bar graph illustrating the relationship
between sales and income for each separate
year of Amazon’s existence.
b. Describe the type of relationship that exists
between the years in business and Amazon’s
sales volume.
c. Amazon’s sales rose sharply. However, its net
income yielded losses, which increased during
the first few years. In which year did this situation
reverse itself and show improvement in the
net income balance sheet?
2-43. The Honda Ridgeline was the highest-ranked compact
pickup in J.D. Power and Associates annual
customer-satisfaction survey released on