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Questions and Answers
What is the advantage of multi-stage sampling?
What is the advantage of multi-stage sampling?
What is a disadvantage of multi-stage sampling?
What is a disadvantage of multi-stage sampling?
What is the critical difference between probability and non-probability sampling methods?
What is the critical difference between probability and non-probability sampling methods?
What is a characteristic of non-probability sampling methods?
What is a characteristic of non-probability sampling methods?
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What is an example of a high-traffic area in convenience sampling?
What is an example of a high-traffic area in convenience sampling?
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What is a limitation of convenience sampling?
What is a limitation of convenience sampling?
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What is the purpose of non-probability sampling methods?
What is the purpose of non-probability sampling methods?
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What is the difference between multi-stage sampling and convenience sampling?
What is the difference between multi-stage sampling and convenience sampling?
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What is the main characteristic of probability sampling?
What is the main characteristic of probability sampling?
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What is the main advantage of probability sampling?
What is the main advantage of probability sampling?
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Study Notes
Probability Sampling Methods
- The method of sampling, not the size of the sample or population, determines whether it's probability or non-probability sampling.
Simple Random Sampling
- All members of the population have an equal probability of being selected for the sample, expressed by the formula: Probability of selection = Sample Size / Population Size.
- Examples include the "blind draw" method and the table of random numbers method.
- Blind draw method: blindly choosing participants by their names or unique designations.
- Table of random numbers method: using a table of random numbers to ensure randomness.
Systematic Sampling
- A probability sampling technique that is often more efficient than simple random sampling.
- Involves a random starting point and a skip interval calculated by dividing the population size by the sample size.
- Example: if the population size is 100,000 and the sample size is 1,000, the skip interval is 100.
Cluster Sampling
- Used for large populations, scattered distributions, or when individual selection is not convenient.
- Involves selecting clusters or groups of the population, such as schools or regions, rather than individual members.
- Example: selecting a sample of 4th-grade students in elementary schools in Ethiopia by random sampling of schools and teachers.
Non-Probability Sampling
- Does not involve probability calculations for selecting samples.
- Examples include convenience sampling, quota sampling, snowball sampling, and judgment sampling.
Convenience Sampling
- A non-probability sampling method that involves selecting samples based on convenience, such as location or accessibility.
- Selection is subjective, and certain members of the population may be excluded, such as those who do not frequent high-traffic areas.
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Description
Learn about probability sampling methods, including simple random sampling and how to calculate the probability of selection in a sample.
