And shopping frequency at the store the table is also

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and Shopping Frequency at the store. The table is also included in the data spreadsheet, in the tab Department Store . Age Shopping Frequency Under 30 30-49 50 and Over Total Low 27 37 31 95 Moderate 48 91 93 232 High 23 51 73 147 Total 98 179 197 474 a) Find the marginal distribution (i.e. compute percentages) of Shopping Frequency . b) Find the conditional distribution (i.e. compute percentages) of Shopping Frequency within each age group. c) Compare these distributions with a segmented bar graph. d) Write a brief description of the association between Age and Shopping Frequency among these respondents. e) Does this prove that customers aged 50 and over are more likely to shop at this department store? Explain. Question 4 – Delivery Service (from the text: Chapter 4, page 83, # 42) A company must decide which of two delivery services they will contract with. During a recent trial period, they shipped numerous packages with each service and have kept track of how often deliveries did not arrive on time. Here are the data. Delivery Service Type of Service Number of Deliveries Number of Late Deliveries Pack Rats Regular Overnight 400 100 12 16 Boxes R Us Regular Overnight 100 400 2 28 a) For the two delivery service providers and both types of services combined, what percentage of all packages were delivered ON TIME? b) Overall, which service had a higher percentage of LATE deliveries? c) For each type of service, compare the percentage of LATE deliveries by each company. Based on the results in part b), the company has decided to hire Pack Rats. Do you agree they deliver on time more often? Why or why not? Be specific. d) The results here are an instance of what phenomenon? 3
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Question 5 – Halifax Real Estate Listings The Canadian Real Estate Association ( www.crea.ca ) collects and analyzes factors affecting the real estate market for the public, Realtors and governments. The accompanying data spreadsheet reports information on 98 residential dwellings in Halifax, Nova Scotia retrieved from the CREA website in December 2010. (The listings are in close proximity to St. Mary’s University and Dalhousie University.) The variables
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