StatTutor Lesson - Conditions for Inference in Practice

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      Questions 1-2

      46

      Question 1.

      If data are collected with a sample survey, how should randomization be implemented?

      A.
      B.

      Correct. Individuals need to be randomly selected in surveys for inference conclusions to be valid.
      Incorrect. Individuals need to be randomly selected in surveys for inference conclusions to be valid.
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      Question 3

      62

      Question 3.

      Which condition is the most important?

      A.
      B.

      Correct. No matter how fancy or elaborate the data analysis, without proper data collection the results may be invalid.
      Incorrect. No matter how fancy or elaborate the data analysis, without proper data collection the results may be invalid.
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      Question 4

      100

      Question 4.

      Is the station’s conclusion justified?

      A.
      B.

      Correct. Data were collected with a call-in opinion poll during a nightly news cast.
      Incorrect. Data were collected with a call-in opinion poll during a nightly news cast.
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      Question 5

      189

      Question 5.

      Which of the following is a result of lack of randomization?

      A.
      B.
      C.
      D.
      E.

      Correct. All of these are consequences of lack of randomization.
      Incorrect. All of these are consequences of lack of randomization.
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      Question 6

      253

      Question 6.

      What is an important step in checking the shape of the population distribution?

      A.
      B.
      C.

      Correct. Since outliers are usually problematic, always plot your data and check for outliers.
      Incorrect. Since outliers are usually problematic, always plot your data and check for outliers.
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      Question 7

      297

      Question 7.

      True or false: All inferential procedures have conditions that need to be checked.

      A.
      B.

      Correct. If a condition required for an inferential procedure is not met, the results may be invalid.
      Incorrect. If a condition required for an inferential procedure is not met, the results may be invalid.
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