Grocery Store Study Administrators at a large grocery store have noticed a big d
ID: 2931973 • Letter: G
Question
Grocery Store Study
Administrators at a large grocery store have noticed a big drop in their revenue so they decide to conduct a survey study to learn more about their customers and find out how they can attract more. They plan to have two staff members stand at the main entrance of the store Monday-Friday, from 9am-5pm for one week in December, 2017 to greet shoppers and to invite them to answer a few questions. Willing shoppers are asked demographic questions (e.g., age, numbers of people in the household, gender), questions related to grocery shopping habits (e.g., number of monthly visits to the grocery store, other places they purchase groceries in a typical month) as well as the following questions: “The grocery store invests a huge amount of our budget to offer our customers a wide variety of high quality produce year-round. Are you satisfied with our produce selection? What else can we do to attract shoppers?” Answer the following questions based on administrators’ plan.
a. Multiple-choice – What is the planned sampling method? Simple random sampling Stratified sampling Cluster sampling Systematic sampling Convenience sampling Volunteer sampling Taking a census
b. Multiple-choice - What type of study is this? Experiment Observational Study
c. What is the i. sample and ii. population in this study? Do not just answer with definitions here – describe what each of these are in the context of this study plan.
d. How might measurement bias be an issue based on this plan? Describe the impact may it have on the results.
e. How might selection bias be an issue based on this plan? Describe the impact may it have on the results.
Explanation / Answer
(a) Correct option: Volunteer sampling
(b) Observational study
(c) (i) Sample: shoppers who answered the questions
(ii) Customers of the large grocery store
(d) measurement bias occurs when the act of sampling causes the measurement to be impacted. Here, since the survey questionaire is handed over in person by the stores staff persons to the customers and the responses are not confidential, it will definitely mostly in favour of the stores only.
(e) Selection bias: The subects studied are not representative of the target population about which conclusions are drawn. Here, only customers coming to stores on a specific period of time on specific days are considered.
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