# Chapter 1. Choosing the Sample Size

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Stat Tutor
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### Question 1.1

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Incorrect. Since the theoretical margin of error requires us to know the value of p in order to estimate p, we do not use the theoretical margin of error.
Correct. Since the theoretical margin of error requires us to know the value of p in order to estimate p, we do not use the theoretical margin of error.
Incorrect. Try again.
2

1:25

### Question 1.2

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Incorrect. The researcher can set a desired margin of error and level of confidence, but needing a value for p* is problematic.
Correct. The researcher can set a desired margin of error and level of confidence, but needing a value for p* is problematic.
Incorrect. Try again.
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2:45

### Question 1.3

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Incorrect. When no value is available, use p* = 0.50 as it will produce an adequate sample size.
Correct. When no value is available, use p* = 0.50 as it will produce an adequate sample size.
Incorrect. Try again.
2

3:40

### Question 1.4

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Incorrect. Population size is not part of the sample size formula.
Correct. Population size is not part of the sample size formula.
Incorrect. Try again.
2

4:17

### Question 1.5

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Incorrect. Use p* = 0.50 when no prior information is available.
Correct. Use p* = 0.50 when no prior information is available.
Incorrect. Try again.
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4:38