7) Many opinion surveys are conducted by mail. In such a sampling procedure, a r

Question

7) Many opinion surveys are conducted by mail. In such a sampling procedure, a random sample of persons is selected from among a list of people who are supposed to constitute a target population. Each is sent a questionnaire and is requested to complete and return the questionnaire to the pollster. Suggest a method the pollster could use to choose a random sample of people to send the questionnaires to? a) b) Why might this type of survey yield a sample that would produce biased inferences, even if the sample is chosen randomly?

Explanation / Answer

a) Simple random sampling with replacement can be used in this scenario

b) Even if the sample chosen randomly yet it can produce biased inferences because here population is the list of people what the pollstar had. So it is not the complete list of people. Thats why some bias may come depending on how population was collected.

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