StatTutor Lesson - Comparing Two Population Means

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      Question 1

      177

      Question 1.

      What parameter do we use to compare two population means?

      A.
      B.
      C.
      D.

      Correct. We use the difference between the two population means as the parameter for comparing the two means.
      Incorrect. We use the difference between the two population means as the parameter for comparing the two means.
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      Question 2

      237

      Question 2.

      If µ1 = µ2, what does µ1 – µ2 equal?

      A.
      B.
      C.
      D.

      Correct. If µ1 = µ2, then µ1 – µ2 = µ2 – µ2 = 0.
      Incorrect. If µ1 = µ2, then µ1 – µ2 = µ2 – µ2 = 0.
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      Question 3

      305

      Question 3.

      True or false: H0: µ1 – µ2 = 0 is equivalent to H0: µ1 = µ2.

      A.
      B.

      Correct. Because µ1 = µ2 implies that µ1 – µ2 = µ2 – µ2 = 0, these two hypotheses are mathematically equivalent.
      Incorrect. Because µ1 = µ2 implies that µ1 – µ2 = µ2 – µ2 = 0, these two hypotheses are mathematically equivalent.
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      Questions 4-5

      348

      Question 4.

      For an observational study, which of the following is an appropriate method of collecting data for a two-sample t procedure?

      A.
      B.
      C.
      D.

      Correct. A separate simple random sample should be taken from each population.
      Incorrect. A separate simple random sample should be taken from each population.
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      Question 6

      395

      Question 6.

      How do you check for Normality for a two-sample t procedure?

      A.
      B.
      C.
      D.

      Correct. To check for Normality, plot each set of data and check each for outliers.
      Incorrect. To check for Normality, plot each set of data and check each for outliers.
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