Chapter 1. Choosing the Sample Size

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Question 1

0:57

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

Question 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.
2

Question 3

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

Question 4

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

Question 5

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.
2

Question 6

4:38

Question 1.6

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Incorrect. 1,068 is between 1,000 and 1,100, so yes 1,068 mets this requirement.
Correct. 1,068 is between 1,000 and 1,100, so yes 1,068 mets this requirement.
Incorrect. Try again.
2

Applet

5:08