StatTutor Lesson - Avoid the Pooled Two-Sample t Procedures

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Avoid the pooled two-sample t procedures
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      Question 1

      62

      Question 1.

      Which two-sample t test is recommended?

      A.
      B.
      C.

      Correct. David S. Moore, the author of Basic Practice of Statistics, recommends the approximate two-sample t.
      Incorrect. David S. Moore, the author of Basic Practice of Statistics, recommends the approximate two-sample t.
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      Question 2

      96

      Question 2.

      What does the pooled two-sample t test require that neither the approximate two-sample t nor the conservative two-sample t requires?

      A.
      B.
      C.

      Correct. The pooled two-sample t test requires equal population standard deviations.
      Incorrect. The pooled two-sample t test requires equal population standard deviations.
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      Question 3

      138

      Question 3.

      True or false: The pooled two-sample t procedure should never be used if one sample standard deviation is more than twice the other.

      A.
      B.

      Correct. This is a true statement. The approximate two-sample t does not have this requirement.
      Incorrect. This is a true statement. The approximate two-sample t does not have this requirement.
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      Question 4

      191

      Question 4.

      Which gives a more accurate P-value?

      A.
      B.

      Correct. Of the two options, the approximate two-sample t test gives a more accurate P-value than the conservative two-sample t test. The pooled two-sample t test is more accurate if the condition of equal standard deviations is met.
      Incorrect. Of the two options, the approximate two-sample t test gives a more accurate P-value than the conservative two-sample t test. The pooled two-sample t test is more accurate if the condition of equal standard deviations is met.
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