StatTutor Lesson - How to Sample Badly

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      Questions 1-2

      57

      Question 1.

      Which of the following is a good sampling technique?

      A.
      B.
      C.
      D.

      Incorrect. Convenience samples, voluntary response samples and mall-intercept samples are not reliable sampling techniques.
      Correct. Convenience samples, voluntary response samples and mall-intercept samples are not reliable sampling techniques.
      Incorrect. Try again.
      2

      Questions 3-6

      170

      Question 3.

      A TV sports commentator asks his listeners to visit a website and vote on which professional basketball player deserves to be selected as MVP (most valuable player). What type of sampling is this?

      A.
      B.
      C.
      D.

      Incorrect. When respondents self-select to respond, the sample is called a voluntary response sample.
      Correct. When respondents self-select to respond, the sample is called a voluntary response sample.
      Incorrect. Try again.
      2

      Questions 7-8

      231

      Question 7.

      Why are non-random samples like convenience and mall-intercept bad?

      A.
      B.
      C.
      D.

      Incorrect. When respondents are not selected using a random device, the method of selection often selects respondents of a certain characteristic which biases the results.
      Correct. When respondents are not selected using a random device, the method of selection often selects respondents of a certain characteristic which biases the results.
      Incorrect. Try again.
      2