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

78 CHAPTER 2 • GRAPHS, CHARTS, AND TABLES—DESCRIBING YOUR DATA
120
Scatter Diagram
100
General Negative Relationship
Training Hours
80
60
40
20
0
0
5,000
10,000
15,000
20,000
25,000
30,000
(U.S. Employees)
2-3: Exercises
Skill Development
2-46. You have the following sales data for the past
12 months. Develop a line graph for these data.
Month Jan Feb Mar Apr May Jun
Sales 200 230 210 300 320 290
Month Jul Aug Sep Oct Nov Dec
Sales 300 360 400 410 390 450
2-47. The following data have been selected on two variables,
y and x. Construct a scatter plot for these
two variables and indicate what type, if any, relationship
appears to be present.
y
x
100 23.5
250 17.8
70 28.6
130 19.3
190 15.9
250 19.1
40 35.3
2-48. The following information shows the year-end dollar
value (in millions) of deposits for Bank of the
Ozarks, Inc. for the years 1997–2004. (Source:
Bank of the Ozarks, Inc., 2004 Annual Report.)
Year
Deposits (in $millions)
1997 296
1998 529
1999 596
2000 678
2001 678
2002 790
2003 1062
2004 1380
Prepare a line chart of the data and briefly describe
what the chart shows.
2-49. The following data represent 11 observations of
two quantitative variables:
x contact hours with client, y profit generated
from client.
x y x y x y x y
45 2,345 54 3,811 34 −700 24 1,975
56 4,200 24 2,406 45 3,457 32 206
26 278 23 3,250 47 2,478
a. Construct a scatter plot of the data. Indicate
whether the plot suggests a linear or nonlinear
relationship between the dependent and independent
variables.
b. Determine how much influence one data point
will have upon your perception of the relationship