Practice: Biased versus Unbiased Samples

An animal rescue center wants to find out if people in its town think more money should be spent on animal welfare. They plan to ask a random sample of their visitors and volunteers to fill in a questionnaire. Why would their sample not be representative of the town’s population?

  • AThere might be a high proportion of children in the sample, which will skew the result.
  • BThe center’s visitors and volunteers are likely to be supportive of spending on animal welfare.
  • CWe do not know how they will ensure that the sample is random.
  • DPeople will not want to spend time filling in the questionnaire.

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