Chapter 1. Introduction to Producing Data: Experiments

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Stat Tutor
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Questions 1-2

0:43

Question 1.1

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Incorrect. We sample whenever a census is not feasible.
Correct. We sample whenever a census is not feasible.
Incorrect. Try again.
2

Question 1.2

beP4UqSX9114RSJ1lVzFc780kXwpiRo6+lgz9fhQwKiYo3jkaa481CtAKaIpMGIzI8mzZhfAm6u4zKyiqGrs0NLBw8pvEm3M3BxO1uWvMej4SP9pG6mt2kQZY7tAW4Rt9FGcH1UKqTJwBlEQl6ZJo1Uszg48FvIm5OuEfZmesnBzRIdHvbXiGGwWuHU=
Incorrect. Inference can be made using data from a non-random sample, but the inference will probably not be valid.
Correct. Inference can be made using data from a non-random sample, but the inference will probably not be valid.
Incorrect. Try again.
2

Questions 3-5

2:14

Question 1.3

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Incorrect. Because subjects are randomly assigned to treatments in an experiment, results from an experiment establish "causation."
Correct. Because subjects are randomly assigned to treatments in an experiment, results from an experiment establish "causation."
Incorrect. Try again.
2

Question 1.4

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Incorrect. In a valid experiment, subjects are assigned to treatments and this assignment should be done randomly.
Correct. In a valid experiment, subjects are assigned to treatments and this assignment should be done randomly.
Incorrect. Try again.
2

Question 1.5

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Incorrect. The responses are compared, but not directly. They are first summarized as either means or proportions and then compared.
Correct. The responses are compared, but not directly. They are first summarized as either means or proportions and then compared.
Incorrect. Try again.
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