Podcast
Questions and Answers
What type of sample is used when the researcher or an individual with knowledge about the population chooses the individuals they feel represent the population?
What type of sample is used when the researcher or an individual with knowledge about the population chooses the individuals they feel represent the population?
- Probability Sample
- Convenient Sample
- Judgment Sample (correct)
- Referral Sample
What is a major limitation of referral sampling?
What is a major limitation of referral sampling?
- It is not suitable for industrial marketing research
- The selectivity used throughout the sampling process (correct)
- It is difficult to get a large sample size
- It is not used in commercial research
What type of sample is used when the researcher establishes a specific quota for various types of individuals to be interviewed?
What type of sample is used when the researcher establishes a specific quota for various types of individuals to be interviewed?
- Judgment Sample
- Quota Sample (correct)
- Convenient Sample
- Probability Sample
What type of sampling is used in focus group studies?
What type of sampling is used in focus group studies?
What is the main advantage of using probability sampling?
What is the main advantage of using probability sampling?
When is referral sampling most appropriate?
When is referral sampling most appropriate?
What type of sampling is used when the researcher has a limited knowledge about the population?
What type of sampling is used when the researcher has a limited knowledge about the population?
What is the main difference between quota sampling and probability sampling?
What is the main difference between quota sampling and probability sampling?
What is a common use of quota sampling?
What is a common use of quota sampling?
What is the main disadvantage of using non-probability sampling methods?
What is the main disadvantage of using non-probability sampling methods?
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Study Notes
Probability Sampling Methods
- The probability of being selected into the sample is known and equal for all members of the population in probability sampling.
- Simple random sampling is a type of probability sampling where every member of the population has an equal chance of being selected.
- The probability of selection is calculated using the formula: Probability of selection = [Sample Size] / Population size
Simple Random Sampling
- The "blind draw" method involves blindly choosing participants by their names or some other unique designation.
- The table of random numbers method uses a listing of numbers with assured random order, making it difficult to see any systematic sequence of numbers.
Simple Random Sampling Procedure
- Steps involved in simple random sampling include:
- Accessing the population as per the specified definition
- Drawing the sample in a two-phase process
- Validating the sample by comparing its demographic profile with a known profile
- Resampling if necessary
Systematic Sampling
- Systematic sampling is a type of probability sampling that employs a random starting point and a fixed interval to select participants.
- It is often preferred over simple random sampling due to its economic efficiency and ease of application.
Non-Probability Sampling Methods
- Judgment samples require the researcher to use their judgment or educated guess to select participants who represent the population.
- Referral sampling involves using existing respondents to refer additional participants, often used in industrial marketing research situations.
- Quota samples establish a specific quota for various types of individuals to be interviewed, determined by research objectives and key characteristics.
Sampling Process
- Steps involved in the sampling process include:
- Accessing the population
- Drawing the sample
- Validating the sample
- Resampling if necessary
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