Tutorial 1

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Seneca College *

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Statistics

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Jun 21, 2024

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Tutorial 1 (Chapter 2 & 3) Problem One (Chapter 2): A real estate agent collected information on some recent local home sales. The first six lines of the database appear below. The columns correspond to the house identification number, the community name, the property’s number of acres, the year the house was built, the market value (in $), and the size of the living area (in square feet). 1. a) What does a row correspond to in this data table? b) How would you best describe its role: as a participant, subject, case, respondent, or experimental unit? 2. How many variables are measured in each row? 3. For each variable, would you describe it as primarily categorical or quantitative? If quantitative, what are the units? If categorical, is it ordinal or simply nominal? 4. Are these data a time series or cross-sectional? Explain briefly. 5. Do the data appear to have come from a designed survey or experiment? What concerns might you have about drawing conclusions from this data set? Problem Two: Eastland College instructors and students are asking to review a new computer tutorial. Peter, author of the tutorial, wants to analyze the feedback. He gets a spreadsheet. List the variables in
the data set. Indicate whether each variable is categorical or quantitative. If the variable is categorical, indicate whether it is nominal or ordinal. Does the table contain an identifier variable? Name Status Tutorial Access ID Level of satisfaction Number of visits per week Time (minutes) spent per week Ann Instructor AB235 Moderately helpful 3 60 Boris Student BC1090 Very helpful 4 120 Parul Student PR1841 Not helpful 1 30 Paul Instructor PG145 Somewhat helpful 2 45 Problem Three: A manufacturing company employs 14 project managers, 48 forepersons, and 377 labourers. In an effort to keep informed about any possible sources of employee discontent, management wants to conduct job satisfaction interviews with a simple random sample of employees every month. 1. Do you see any danger of bias in the company’s plan? Explain. 2. How might you select a simple random sample? 3. Why do you think a simple random sample might not provide the representative opinion the company seeks? 4. What ethical issue would be involved if the company statistician conducted the survey this way? (See Appendix C . in your textbook) 5. Propose a better sampling strategy. 6. Listed below are the last names of the project managers. Use random numbers to select two people to be interviewed. Be sure to explain your method carefully.
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