research methods (yr12) Flashcards
what are the 3 types of hypothesis?
directional
non directional
null
what is a directional hypothesis?
makes a precise prediction of the exact direction results are expected to go in
what is a non directional hypothesis?
makes a cautious prediction and states a change but not the direction of that change
what is a null hypothesis?
predicts that there will be no change or relationship/it does the opposite of the experimental design
what are extraneous variables?
give an example
variables that affect ALL pps involved e.g time of day
what are confounding variables?
give an example
variables that affect SOME of the pps involved e.g hungry
what are the 3 types of experiment?
lab
field
natural
strengths of a lab experiment (3)
- high level of control of both the IV and EV
- easy to replicate
- can conclude cause and effect
weaknesses of a lab experiment (3)
- lack ecological validity
- high chance of investigator and participant effect
- lack mundane realism
strengths of a field experiment (3)
- can conclude cause and effect
- higher level of ecological validity
- reduction in participant effects e.g demand characteristics
weaknesses of a field experiment (3)
- less control due to more natural setting
- more time consuming
- random allocations to conditions is difficult
a strength of a natural experiment
- high levels of ecological validity - can generalise findings
weaknesses of a natural experiment (3)
- cannot conclude cause and effect - problems with internal validity
- no random allocations to conditions
- conditions vary naturally
what is a case study?
gathering of information about an individual or group of people that typically involves the production of a case history
strengths of a case study (4)
- produce rich data (qualitative)
- high levels of ecological validity - generalise findings
- can be used to investigate rare human behaviour
- lead to new psychological insights
weaknesses of a case study (5)
- difficult to replicate - hard to establish reliability of data
- possibility of researcher bias is high
- retrospective data collection is unreliable
- ethical issues e.g confidentiality
- low population validity
strengths of correlational studies (4)
- can establish a relationship between 2 variables
- procedures can be repeated to confirm findings
- can stimulate areas for additional research
- can be used when it would be unethical or impractical to manipulate variables
what are the 2 types of self report methods?
what is a common research method?
questionnaires and interviews
diary studies
strengths of self report methods (2)
- research pps don’t have to recollect exact details from past events so less likely to experience recall problems
- use diary entries as a starting point for understanding of behaviour
weaknesses of self report methods (2)
- data may be untruthful and subject to social desirability bias
- diaries are problematic - pps may not want to record their daily activities
strengths of questionnaires (3)
- researchers don’t have to be present - reduction in investigator effects
- collect the same information from large samples quickly and conveniently
- ask people directly how they think and feel
weaknesses of questionnaires (3)
- social desirability
- sample may be bias as only certain individuals fill in questionnaires
- may obtain different interpretations of questions
what are the 2 types of interviews?
structured and semi structured
what is a structured interview?
questions have exactly the same wording and order for each interviewee