StatTutor Lesson - Inference about the Population

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Inference about the population 2011
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      Questions 1-2

      23

      Question 1.

      Fill in the blanks: Statistical inference is using information from a _______________ to draw conclusions about a ______________________.

      		A.
      		B.
      		C.
      		D.
      Incorrect. Statistical inference is using information from a sample to draw conclusions about a population.
      Correct. Statistical inference is using information from a sample to draw conclusions about a population.
      Incorrect. Try again.
      2

      Questions 3-7

      95

      Question 3.

      Which of the following is NOT a random sample?

      		A.
      		B.
      		C.
      		D.
      Incorrect. Respondents are selected based on convenience rather than with a random device so a convenience sample is not a random sample.
      Correct. Respondents are selected based on convenience rather than with a random device so a convenience sample is not a random sample.
      Incorrect. Try again.
      2

      Questions 8-10

      258

      Question 8.

      Which of the following is NOT a problem for a non-random sample?

      		A.
      		B.
      		C.
      		D.
      Incorrect. A non-random sample is easier to obtain than a random sample.
      Correct. A non-random sample is easier to obtain than a random sample.
      Incorrect. Try again.
      2

      Questions 11-12

      299

      Question 11.

      True or false: Inference is not appropriate using results from a non-random sample.

      		A.
      		B.
      Incorrect. This is a correct statement.
      Correct. This is a correct statement.
      Incorrect. Try again.
      2

      Questions 13-15

      363

      Question 13.

      True or false: A good random sample always exactly mirrors the population from which it is taken.

      		A.
      		B.
      Incorrect. It is unlikely that the results from a random sample are exactly the same as the population.
      Correct. It is unlikely that the results from a random sample are exactly the same as the population.
      Incorrect. Try again.
      2