a small grocery chain in a city wants to know the opinions of its customers rega

Question

a small grocery chain in a city wants to know the opinions of its customers regarding the quality of the produce selection. Which survey method is likely to produce the least amount of bias:

a: randomly select one of the grocery stores and then randomly select 10 customers from that store to survey

b: randomly select several stores from all the stores in the city and then randomly select 10 customers from each of these stores to survey

c; post a survey online and make an announcement of all customers inviting them to participate in the survey

d: survey every 10th person that walks out of one of the stores during regular business hours

Explanation / Answer

a) Not recommended as the infromation collected from this survey explains about only one store.

b) This an apt method as the survey provides information of all stores at randomly.

c) Customers may not participate actively in online stores and reliability of information is low

d) This increases the cost of survey.

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