Spm. 4 "Compare differences between probabilistic and non-probabilistic sampling techniques" Flashcards
What is a probability sampling (nr. 1)?
A sampling orocedure in which each element of the population has a fixed probabilistic chance of being selected for the sample
What is the most important decision about the choice of sampling techniques?
The mort important decision about the choice of sampling techniques is whether to use non-probability or probability techniques.
- Non-probability sampling relies on the judgement of the researcher
- Probability sampling relies on chance
What is probability sampling (nr. 2)?
This type of sampling is based on random selection and a particular population element or unit will be included in the sample is known.
The sample is representative and the result can be generalized
What is non-probability sampling?
The inclusion or exclusion of elements in a sample is left to the discretion of the researcher.
Not every element of the target population has a chance of being selected into the sample.
The probability that a particular unit will be included in the sample is not known
What is the different types of “probability sampling?
Simple random sampling (SRS) Systematic sampling Stratified sampling Cluster sampling Multi-stage
What is the different types of “Non-probability sampling”?
Convenience Sampling
Judgemental Sampling
Quota Sampling
Snowball Sampling
When should you choose non-probability sampling?
NOF: Exploratory RME: Non-sampling errors are larger VITP: Homogeneous (low) SC: Unfavourable OC: Favorable
When should you choose probability sampling?
NOF: Conclusive RME: Sampling errors are larger VITP: Heterogeneous (high) SC: Favourable OC: Unfavorable
What is a “simple randon sample”?
Every member of the population has a known and equal chance of selection
What is a “stratified random sample”?
The population is divided into mutally exclusive groups (such as age groups), and random samples are drawn from each group
What is a “Cluster (area) sample”?
The population is divided into mutally exclusive groups (such as streets), and the researcher draws a sample of thhe groups to interview
What is a “Convenience sample”?
The researcher selects the easiest population members from which to obtain information
What is a “Judgement sample”?
The researcher uses his or her judgement to select population members who are good prospects for accurate information
What is a “Quota sample”?
The reseacher finds and interviews a prescribed number of people in each of several categories
