Research Methods- Sampling

Question 1

What is sampling bias?

Answer 1

If studies do not obtain a representative sample.

Question 2

What is random sampling and how do you conduct it?

Answer 2

All members have an equal chance of being selected.
1. Obtain list of members
2. Assign them each a number
3. Pick sample using a lottery method

Question 3

How is opportunity sampling conducted?

Answer 3

1. Researcher offers the opportunity to take part in their study in a location where target population would usually be found.
2. Sample is formed from people who agree to take part.

Question 4

How is volunteer sampling conducted?

Answer 4

1. Advert is placed for ptpts to volunteer themselves
2. Sample is formed from volunteers

Question 5

How is systematic sampling conducted?

Answer 5

1. Make an alphabetical list of ptpts
2. Select every nth person to be in the sample

Question 6

How is stratified sampling conducted?

Answer 6

1. Researcher identifies strata that make up target population
2. Proportions of different individuals are worked out using formula:
   Sample size over population size X subgroup size
3. Ptpts making up each stratum randomly selected