Chapter 1. Conditions for Inference in Practice

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Questions 1-2

0:46

Question 1.1

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Correct. Individuals need to be randomly selected in surveys for inference conclusions to be valid.
Incorrect. Individuals need to be randomly selected in surveys for inference conclusions to be valid.
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Question 1.2

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Correct. Individuals need to be randomly allocated to treatments in experiments for inference conclusions to be valid.
Incorrect. Individuals need to be randomly allocated to treatments in experiments for inference conclusions to be valid.
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Question 3

1:02

Question 1.3

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Correct. No matter how fancy or elaborate the data analysis, without proper data collection the results may be invalid.
Incorrect. No matter how fancy or elaborate the data analysis, without proper data collection the results may be invalid.
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Question 4

1:40

Question 1.4

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Correct. Data were collected with a call-in opinion poll during a nightly news cast.
Incorrect. Data were collected with a call-in opinion poll during a nightly news cast.
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Question 5

3:09

Question 1.5

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Correct. All of these are consequences of lack of randomization.
Incorrect. All of these are consequences of lack of randomization.
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Question 6

4:13

Question 1.6

e78uiHaUj1q1/mIcUvy4iKlQzMqp9T87cOHIA/V/1S6aPsSDdsWFZfoxXndq6Jy4swumsW5FkBDd7JC4HDjG2Lt4jTZsx2Wy3b3/UphyqxZX6PwRP057BzWtopmMjPFb4veBFLkb5ogqct+D2ukL8qB1qfIVED18+J0XD6wXzedj8b4zf4U2HzcQuZHWGyGllMrtq2ykR32Bv/fokeKxOcTZhqOzQkvGWEL7YW04r+eeAR3QizMj9S4mIHMLqv91qrZyORzcJ0BhEEPF64hDLjM88a8S8KieF2IxrQ==
Correct. Since outliers are usually problematic, always plot your data and check for outliers.
Incorrect. Since outliers are usually problematic, always plot your data and check for outliers.
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Question 7

4:57

Question 1.7

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Correct. If a condition required for an inferential procedure is not met, the results may be invalid.
Incorrect. If a condition required for an inferential procedure is not met, the results may be invalid.
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