Exam-1-Universe-Q

# Exam-1-Universe-Q - BUS-271 Exam-1 Universe...

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1 BUS-271 Exam-1 Universe Questions 2011-08-19 [Edited 7/28/2010] 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? b) [2 p.] What do we call the column containing everyone’s GPA? c) [4 p.] Define the difference between Qualitative and Quantitative data d) [6 p.] For each of the 3 columns above, state whether it contains qualitative or quantitative data, and what ty pe of “scale” it is. e) [4 p.] Define what we mean by “time series” and “cross sectional” data. f) [2 p.] Does the above data set contain time-series or cross-sectional data? 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. h) [2 p.] What does the acronym “GIGO” stand for? What does it mean in the context of statistics?

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2 102. [Chapter 1; 6 points] (Definitions) Explain the difference between a “population” and a “sample”. Does this distinction reside in the data, or does it depend on how we plan to use the data? 103. [Chapter 1; 3 points] (Definitions) Define what we mean by an “outlier.” Why do we care about outliers? 104. [Ch. 1; 3 points] (Definitions) Define what we mean by “sampling bias”. 105. [Ch. 1; 3 points] (Definitions) What do we mean by the term “sampling error”? 106. [Ch. 1; 5 points] (Sampling) You want to estimate the average family income in the local area. You select as your sample everyone who has dinner at the Outback one evening. What could potentially be wrong with this procedure? 107. [Ch. 1; 5 points] (Sampling) You want to estimate the average family income in the local area. You select as your sample everyone who eats lunch at Crystal one day. What could potentially be wrong with this procedure? 108. [Ch. 1; 5 points] (Sampling) You want to estimate the average family income in Lee County. You select your sample from people who are attending an Auburn football game. What could potentially be wrong with this procedure?
3 109. [Chapter 1; 6 points] (Definitions) (a) [3 p.] Explain the difference between a “population” and a “sample”. (b) [3 p.] Explain the difference between a census and a sample data set. 191. [Ch. 1; 12 points] In our survey the first day of class, we collected data on several variables. For each of the variables below, indicate whether they represent qualitative or quantitative data, and what “scale” they are: a) The brand of car you drive: b) How well you like math (scale of 1 to 5): c) Your SAT score: d) Your letter grade GPA: e) Your numerical GPA: f) How many hours you work per week:

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4 192. [Ch. 1; 8 points]
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Exam-1-Universe-Q - BUS-271 Exam-1 Universe...

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