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Transcript of Sociology sampling
e.g. when names are picked out of a hat.
Non Random Sampling is employing a technique or system in which a selection is to meet a specific or predetermined criteria.
Target population: Is a large group of people about which the sociologists use to find their conclusions.
E.g. Young people and single parents.
Sample: Is a small group of people who are selected from the target population.
Representative Sample: Is how much the sample reflects the larger population.
E.g. in terms of sex, age, class, gender, ethnicity and marital status.
Sample Frame: Is a list of people from which a sample will be drawn from the target population. Advantages and disadvantages of random sampling.
Quick and easy.
Everyone in the population has the same amount of chance which means that the research is non bias. Disadvantages:
Requires up to date completed and accurate sampling frame.
Can unrepresentative - e.g. majority same sex.
The researcher is told all the background information before he carries out particular research.
Not Random - less equal chance.
May deter people - researcher ask a few personal questions to see if people fit the criteria.
Allows researcher to control variables without having a sample frame.
Researcher knows the exact amount of people - specific characteristics to question.
Quick, easy and cheap - if a refusal you can ask another person with the same characteristics. Stratified Sampling: Snowball Sample Split the sample down into groups and select randomly from these groups. The groups that the research is choosing from must be the same proportion as in the target population studied, to protect representativeness .
Effective as it allows the researcher to control the variables that are important to the research?
It can also increase precision and is therefore likely improve representativeness.
It is complex and time consuming to identify strata and sample various sub groups of the target population.
Often it is not practical as the sampling frame does not contain the information required to split the population into groups. Where you use personal contacts in order to build a sample group.
E.g. Friend calling everyone in phonebook and they pass it on.
No sampling frame is needed.
Can allow access to sensitive and secretive groups
E.g. Drug uses and alcoholics.
Clearly not representative, as people are known by the researcher and known by the network of contacts.
May run out of participants making it difficult to generalise. Convenience and opportunity Involves selecting participants to the researcher.
Cheap, quick and easy.
No sampling frame is needed.
Sample is non representative.
Bias sampling die to the choice of the person who relies on the judgment of the researcher. Thank you for watching Target Technique Dictionary Quota Sampling: Non Random sample