Question A
For each of the following research projects, list two variables for stratification of the sample.
1) A nationwide study of hotels is being conducted to determine the extent of availability of online
contend for customers. A sample of hotels will be taken.
2) A consumer panel is to be formed. Members of the panel will be interviewed periodically in an
effort to understand current consumer attitudes toward soft drinks.
Question B
Suppose that you want to analyze the probability of needing intensive care for patients with a new
infectious disease. You obtain from country A’s website a list of people who have tested positive of
this disease and their symptoms. List one possible source of selection bias.
Question C
A real estate agent would like to examine the relationship between a house’s appraisal value and its
selling price. She has data on 150 houses that were recently sold in Melbourne. Included in this data
set are observations for each of the following variables: the appraised value of each house (in thousands
of dollars), the size of each house (in hundreds of square feet), the number of bedrooms in each house,
and which suburb the house resides (in postcode). The data are in the file Houses.xlsx. She needs
to obtain records on the selling price of these houses but does not have sufficient time to do so for all
150 houses. Rather, she would like to select a representative sample of 30 houses.
- Use Excel to generate a simple random sample of size 30 from the given frame.
- Use Excel to generate a systematic sample of size 30 from the given frame.
- Use Excel to generate a sample of size 30 that have been stratified by the number of bedrooms.
- The list of houses are in 10 suburbs, each with 15 houses. Describe how to apply cluster sampling
based on the suburb. What are the advantages and disadvantages of employing cluster sampling
in this case?
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