StatTutor Lesson - The Chi-Square Distributions

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      Question 1

      72

      Question 1.

      True or false: All shapes of chi-square distributions are right skewed.

      A.
      B.

      Incorrect. This is a true statement.
      Correct. This is a true statement.
      asdf
      Incorrect. Try again.
      2

      Question 2

      113

      Question 2.

      What are the degrees of freedom for this two-way table?

      A.
      B.
      C.
      D.

      Incorrect. (r - 1)(c - 1) = (3 - 1)(2 - 1) = 2.
      Correct. (r - 1)(c - 1) = (3 - 1)(2 - 1) = 2.
      Incorrect. Try again.
      2

      Question 3

      203

      Question 3.

      What row of the chi-square table is used to find the P-value for the chi-square test statistic value of 10.5?

      A.
      B.
      C.
      D.

      Incorrect. Since df = 2, the "2" degrees of freedom row is used to find the P-value.
      Correct. Since df = 2, the "2" degrees of freedom row is used to find the P-value.
      Incorrect. Try again.
      2

      Question 4

      214

      Question 4.

      True or false: Finding the P-value for a chi-square test is much easier with statistical software than by hand.

      A.
      B.

      Incorrect. Because the test statistic requires computing a value for every cell and summing and because the chi-square table does not give exact P-values, using statistical software is much easier than by hand and is recommended.
      Correct. Because the test statistic requires computing a value for every cell and summing and because the chi-square table does not give exact P-values, using statistical software is much easier than by hand and is recommended.
      Incorrect. Try again.
      2