booklet 2 pt2 Flashcards
What type of data does case studies collect?
Qualitative.
Give 2 strengths of case studies
-Allows us to study rare behavior, psychologists can analyse data they have little understanding of, providing more in-depth research.
-No manipulation and occurs in real-world setting>increases validity
Give 2 weaknesses of case studies
-Low generalisability: only studying one individual, unique characteristics does not apply to everyone else, cannot be generalised to the wider population>decreases external validity.
-Cannot be replicated>decreases validity.
What is the difference between the population and the sample in a study?
Population=target group of people the researcher is studying
Sample=group of people selected to take part in the study, drawn from the target population.
What are the 5 different ways of collecting a sample?
-Random
-Systematic
-Stratisfied
-Opportunity
-Volunteer
What is random sampling? E.g?
Each member of the target population has an equal chance of being selected.
E.g. picking names from a hat.
What is systematic sampling? E.g?
A ppt is selected in a systematic way.
‘nth term’
E.g. selecting every 10th person
What is stratisfied sampling? E.g?
The make-up of the sample reflects the make-up of the target population.
*(ratios)
E.g. if theres more female than male teachers, there should be more female ppts.
*in a sample of 20 where 60% teachers are female=12 female teachers, 8 male teachers.
What is opportunity sampling? E.g?
Ppts are selected from whoever is most easily available.
E.g. standing on a street and approaching passers-by to see if they want to take part.
What is volunteer sampling? E.g?
Ppts put themselves foward to take part in a study.
E.g. an advert is placed asking for volunteers, and ppl respond aggreeing to take part.
What are the steps in carrying out random sampling? (3)
- Collect all names of potential ppts
- Put all the names of ppts into a hat
- Pull the names out of hat until the sampling frame is complete
What are the steps in carrying out systematic sampling? (3)
- List every member of the population in ORDER e.g. alphabetical
- Assign every population member a number
- Chose the nth (e.g. every 4th person in list) person until sample is complete
What are the steps in carrying out stratified sampling? (4)
- Identify sub-groups in their population
- Calculate the required proportion from each sub group based on the proportion in the population
- Select sample at random from each sub-group
What are the steps in carrying out opportunity sampling? (2)
- Stand in a convenient place e.g. streets
- When someone who ‘fits the bill’ walks past, ask them to participate in the study
What are the steps in carrying out volunteer sampling? (3)
- Place a poster in a convenient setting e.g. school
- On the poster include sign up details
- The first x amount to sign up participate in the study.