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BUS271 Exam1 Universe Answers
20110824
CHAPTER 1
101. [Chapter 1; 24 points] (Definitions)
Use the following recent survey data to answer questions (a) through (h):
A
B
C



Bob
72
Pan Am
A
Alice
36
American
D
Peter
66
American
G
Aisha
58
Southwest
A
Janet
88
United
B
Where:
A = respondent’s height in inches
B = his or her favorite airline to fly
C = their lettergrade GPA
a) [2 p.] What do we call the line of data that pertains to Alice?
Full credit: an observation
.
Partial credit: an entity.
(Alice is the entity, the data are the observation.)
b) [2 p.] What do we call the column containing everyone’s GPA?
Full credit: a variable
.
Partial credit: a characteristic.
c) [4 p.] Define the difference between Qualitative and Quantitative data
Qualitative data assign the entity in question to a category
–
you drive a Yugo, you drink Perrier.
Quantitative data are numerical (integers or real numbers), which are
the result of measurements: how much, how many, how far, how long,
etc.
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d) [6 p.] For each of the 3 columns above, state whether it contains
qualitative or quantitative data, and what type of “scale” it is.
Column A: Quantitative data, ratio scale.
Column B: Qualitative data, nominal scale.
Column C:
Qualitative data, ordinal scale.
Note: GPA would have been quantitative if given as a number, but
here it was given only as a grade category which makes it qualitative.
e) [4 p.] Define what we mean by “time series” and “cross sectional” data.
Time series data consists of data collected from the same entity at
different points in time. Example: U.S. GDP for every year from 1950 to
2000.
Crosssectional data consists of data collected from many different
entities at the same point in
time. Example: Last year’s GDP for all
member countries of the OECD.
f) [2 p.] Does the above data set contain timeseries or crosssectional data?
Crosssectional data.
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g) [2 p.] (Data quality) Pick two individual data items from the survey data
above that you would suspect needed further checking (i.e. that you feel
have the greatest probability of being wrong.) Justify your selections.
I had in mind these:
(a) Alice’s height of 36 inches, which is pretty short;
(b) Janet’s height of 88 inches, w
hich is quite tall;
(c) Bob’s choice of airline –
PanAm went out of business in 1991.
(d) Peter’s GPA: “G” is not a valid letter grade.
Note: a “data item” refers to one answer (number or category or name) in
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This document was uploaded on 09/23/2011.
 Spring '09
 Business

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