Sampling methods & Ethics

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  • Created by: Georgia
  • Created on: 09-04-12 23:46

Sampling Methods

Opportunity Sample: Consists of taking the sample from people who are available at the time the study is carried out and fit the criteria your are looking for.

Random Sampling: When every member of the population has an equal chance of being chosen.

Self-Selected Sample :(or volunteer sampling) consists of participants becoming part of a study because they volunteer when asked or in response to an advert.

Snowball Sample: Can be used if your population is not easy to contact. 

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Strengths and weaknesses of sampling method

Strengths: Quick & easy to select the sample as you simply take advantage of the people that are around. No need to select people because of predetermined catergories for characteristics.                   Weaknesses: May be biased as unlikely to be representative of a target population.

Strengths: Identifying everyone in the target population and then selecting the number of participants needed.                                                                                                                                            Weaknesses: 1)Time consuming. 2) Often impossible to carry out when you have a large target population.

Strengths: 1) Useful as it's quick and relatvely easy to do. 2) Can also reach a wide variety of participants.                                                                                                                                   Weaknesses: Type of participants who volunteer may not be large representative the target population.

Strengths:Process is cheap,simple and cost efficient. Technique needs little planning amd fewer workforce.                                                                                                                                      Weaknesses: 1) Representatives of the sample is not guaranteed. 2) Researcher has little control over the samling method. 

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Withdrawal from the investigation


Protection of participants

Observational Research

Giving Advice


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