Chapter 1. Testing Lack of Correlation

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Question 1

1:14

Question 1.1

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Correct. The tests are the same.
Incorrect. The tests are the same.
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Question 2

3:05

Question 1.2

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Correct. This is a correct statement.
Incorrect. This is a correct statement.
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Question 3

4:07

Question 1.3

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Correct. Without a measure of variability, we cannot get a P-value. And without a P-value we cannot decide whether to reject H0.
Incorrect. Without a measure of variability, we cannot get a P-value. And without a P-value we cannot decide whether to reject H0.
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Question 4

4:25

Question 1.4

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Correct. We do need the means and standard deviations and we do need a linear relationship for correlation, but we don’t need to do prediction.
Incorrect. We do need the means and standard deviations and we do need a linear relationship for correlation, but we don’t need to do prediction.
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Question 5

4:57

Question 1.5

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Correct. All inferential procedures have conditions that need to be met, including testing correlation.
Incorrect. All inferential procedures have conditions that need to be met, including testing correlation.
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Question 6

5:13

Question 1.6

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Correct. Since P-value < 0.0001 is less than α = 0.05, we can reject H0.
Incorrect. Since P-value < 0.0001 is less than α = 0.05, we can reject H0.
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Question 7

5:37

Question 1.7

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Correct. Since the relationship is significant, the draft was not fair because those with birthdays late in the year were more likely to have a high draft number (i.e., a draft number close to 1.0.)
Incorrect. Since the relationship is significant, the draft was not fair because those with birthdays late in the year were more likely to have a high draft number (i.e., a draft number close to 1.0.)
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