Tutorial 2
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Transcript of Tutorial 2
TUTORIAL 2 (Week starting 8 October 2012)
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Problem 1. (Exercise 3.54, p. 97 of textbook) The data presented below represents full‐time average annual gross wages and salaries in the entire economy of selected Organisation for Economic Co‐operation and Development (OECD) member countries.
Country Average full time wages
United States 51493
Luxembourg 50610
Switzerland 47810
Australia 45385
Netherlands 45161
Ireland 45160
United Kingdom 43607
Norway 43250
Denmark 42173
Belgium 41923
Austria 41421
Germany 37544
France 37269
Sweden 35582
Finland 34903
Spain 32957
Japan 32816
South Korea 32638
Italy 32121
Greece 27460
Portugal 22666
Czech Republic 19618
Hungary 18220
Poland 17812
a. Construct a box‐and‐whisker plot for these data. b. Discuss the shape of the distribution from the plot. c. Are there outliers? What are they and why do you think they are outliers?
Problem 2. (Exercise 4.44, p. 142 of textbook) A survey by Tripadvisor studied the types of activities British people favour while on holidays in a recent year. Among other things, 64% of British people reported preferring a beach holiday and 62% reported getting in touch with work. Respondents to the study were allowed to select more than one activity. Suppose
that of those who took a beach holiday, 78% checked in with work. One of these survey respondents is selected randomly.
(p.t.o)
a. What is the probability that while on holiday this respondent checked in with work and took a beach holiday? b. What is the probability that while on holiday this respondent neither took a beach holiday nor checked in with work? c. What is the probability that while on holiday this respondent took a beach holiday given that the respondent checked in with work? d. What is the probability that while on holiday this respondent did not check in with work given that the respondent took a beach holiday? e. What is the probability that while on holiday this respondent did not check in with work given that the respondent did not take a beach holiday ? f. Construct a probability matrix for this problem.
Problem 3 (Exercise 4.34, p. 137) – (Time Permitting, otherwise consider it as homework) Suppose 70% of all companies are classified as small companies and the rest as large companies. Suppose further, 82% of large companies provide training to employees, but only 18% of small companies provide training. A company is randomly selected without knowing if it is a large or small company; however, it is determined that the company provides training to employees. What are the prior probabilities that the company is a large company or a small company? What are the revised probabilities that the company is large or small? Based on your analysis, what is the overall percentage of companies that offer training?