sampling -

• what are the strengths of self - selected sampling?

  better ethically as participants are volunteering themselves so are more likely to have consent.
• what is self selected sampling?


  when researchers ask for volunteers (usually done via advert).
• what are the strengths of opportunity sampling?


  time - efficient as it requires little to no prior planning.
• what are the weaknesses of opportunity sampling?


  there is a possibility that the sample may under represent as it depends on whoever is there at the time of the study taking place.
• what is random sampling?


  you give every member of the target population an equal chance of being chosen to be in your sample (e.g. pulling names out of a hat).
• what are the strengths of random sampling?


  equal chance of being chosen for the study - no researcher bias.
• what are the weaknesses of random sampling?

  • chance the sample may not be representative as it could by chance select participants that are similar (e.g. race, gender, personality).
  • time consuming.
• what is opportunity sampling?


  you use only members of the target population who are available to you at the time you do the study.
• what are the weaknesses of self - selected sampling?

  • opportunity for there to be bias if researchers are over subscribed with participants - may end up picking the ones they think will fit their hypothesis.
  • unrepresentative sample as similar types of people may offer to volunteer and may miss other types of people.