Exam-1-Universe-Ch1-A

# Exam-1-Universe-Ch1- - BUS-271 Exam-1 Universe Answers CHAPTER 1 101[Chapter 1 24 points(Definitions Use the following recent survey data to answer

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1 BUS-271 Exam-1 Universe Answers 2011-08-24 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 letter-grade 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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2 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. Cross-sectional 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 time-series or cross-sectional data? Cross-sectional data.
3 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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Exam-1-Universe-Ch1- - BUS-271 Exam-1 Universe Answers CHAPTER 1 101[Chapter 1 24 points(Definitions Use the following recent survey data to answer

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