Sampling methods & Ethics

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. 

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. 

Consent

Deception      

Debriefing

Withdrawal from the investigation

Confidentiality

Protection of participants

Observational Research

Giving Advice

Colleagues