# Chapter 1. Inference about the Population

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Stat Tutor
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0:23

### Question 1.1

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Incorrect. Statistical inference is using information from a sample to draw conclusions about a population.
Correct. Statistical inference is using information from a sample to draw conclusions about a population.
Incorrect. Try again.
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### Question 1.2

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Incorrect. Statistical inference is only valid for random samples.
Correct. Statistical inference is only valid for random samples.
Incorrect. Try again.
2

1:35

### Question 1.3

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Incorrect. Respondents are selected based on convenience rather than with a random device so a convenience sample is not a random sample.
Correct. Respondents are selected based on convenience rather than with a random device so a convenience sample is not a random sample.
Incorrect. Try again.
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### Question 1.4

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Incorrect. This is a correct statement.
Correct. This is a correct statement.
Incorrect. Try again.
2

### Question 1.5

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Incorrect. This is a correct statement.
Correct. This is a correct statement.
Incorrect. Try again.
2

### Question 1.6

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Incorrect. If a sample is truly random, then we CAN compute the probability of getting that sample.
Correct. If a sample is truly random, then we CAN compute the probability of getting that sample.
Incorrect. Try again.
2

### Question 1.7

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Incorrect. This is a correct statement.
Correct. This is a correct statement.
Incorrect. Try again.
2

4:18

### Question 1.8

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Incorrect. A non-random sample is easier to obtain than a random sample.
Correct. A non-random sample is easier to obtain than a random sample.
Incorrect. Try again.
2

### Question 1.9

Incorrect. Random samples are required for statistical inference so that bias is minimal, probabilities can be computed and sampling error can be measured.
Correct. Random samples are required for statistical inference so that bias is minimal, probabilities can be computed and sampling error can be measured.
Incorrect. Try again.
2

### Question 1.10

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Incorrect. Both types of sampling could have non-response or response bias. Care must be taken to minimize response bias in a random sample.
Correct. Both types of sampling could have non-response or response bias. Care must be taken to minimize response bias in a random sample.
Incorrect. Try again.
2

4:59

### Question 1.11

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Incorrect. This is a correct statement.
Correct. This is a correct statement.
Incorrect. Try again.
2

### Question 1.12

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Incorrect. Because random samples use a random device to select individuals to be sampled, laws of probability can be applied to the results.
Correct. Because random samples use a random device to select individuals to be sampled, laws of probability can be applied to the results.
Incorrect. Try again.
2

6:03

### Question 1.13

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Incorrect. It is unlikely that the results from a random sample are exactly the same as the population.
Correct. It is unlikely that the results from a random sample are exactly the same as the population.
Incorrect. Try again.
2

### Question 1.14

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Incorrect. Even if two samples are taken at random, the sample results will differ due to chance.
Correct. Even if two samples are taken at random, the sample results will differ due to chance.
Incorrect. Try again.
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### Question 1.15

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Incorrect. This is a correct statement.
Correct. This is a correct statement.
Incorrect. Try again.
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