Chapter 1. Comparing Two Population Means

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Question 1

2:57

Question 1.1

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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

3:57

Question 1.2

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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

5:05

Question 1.3

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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

5:48

Question 1.4

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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 1.5

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Correct. A completely randomized design with two treatments should be carried out. This involves randomly allocating subjects to the two treatments.
Incorrect. A completely randomized design with two treatments should be carried out. This involves randomly allocating subjects to the two treatments.
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Question 6

6:35

Question 1.6

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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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