Chapter 1. Simpson's Paradox

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Stat Tutor
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Questions 1-3

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Question 1.1

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Incorrect. Accident victims are not flown to the hospital in a helicopter unless their condition is very serious. So accident victims who are flown to the hospital in a helicopter are more likely to die due to their condition than accident victims who are driven to the hospital in an ambulance. The other two examples do not have an obvious lurking variable.
Correct. Accident victims are not flown to the hospital in a helicopter unless their condition is very serious. So accident victims who are flown to the hospital in a helicopter are more likely to die due to their condition than accident victims who are driven to the hospital in an ambulance. The other two examples do not have an obvious lurking variable.
Incorrect. Try again.
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Question 1.2

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Incorrect. Simpson's paradox occurs when the relationship between two variables reverses with the inclusion of a third lurking variable.
Correct. Simpson's paradox occurs when the relationship between two variables reverses with the inclusion of a third lurking variable.
Incorrect. Try again.
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Question 1.3

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Incorrect. The relationship between two variables might be different from what you expect because a third lurking variable has been ignored.
Correct. The relationship between two variables might be different from what you expect because a third lurking variable has been ignored.
Incorrect. Try again.
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