Types of Research Methods
WJEC PY3 revision on the different types of research methods.
- Created by: Flo
- Created on: 02-06-12 17:52
Laboratory Experiments
The researcher deliberatly manipulates the IV while maintaing strict control over extraneous variables through standadised procedures in a controlled environment.
Advantages;
- High control means better internal validity
- Replicable so reliability can be cheaked
- Control over all variables allows experimenter to establish causal relationships
Disadvantages;
- Low ecological validity due to being conducted in artificial setting
- High chance of demand characteristics as Ps know they are being studied
Field Experiment
The researcher deliberatly manipulates the independant variable, but does so in the subjects own natural environment.
Advantages;
- Higher ecological validity because it takes place in a real life environment.
- Less bias from sampling as subjects are not brought into lab.
- Less chance of demand characteristics (if subjects are unaware of being tested)
Disadvantages;
- Less controll over other variables meaning more bias likely from extraneous varables so lower internal validity.
- More difficult to replicate exactly so difficult to test tempral validity
- More difficult to record data accuratly
Natural Experiments
The IV is changed by natural occurance; the researcher just records the effect on the DV. The experimenter is laking in control over the IV (Quasi experiments)
Advantages;
- Has high ecological validity since the IV is a 'natural' change and occurs in a natural environment.
- Less bias from sampling as subjects are not chosen by experimenters
- No/low chance of demand characteristics
Disadvantages;
- Hard to infer cause and effect due to little control over extraneous variables and no direct manipulation of the IV.
- Virtually impossible to replicate exactly so tempral validity cannot be tested
Correlations
A method of data analysis which measures the relationship between two or more variables or systematic pattern exists between them.
Advantages;
- Useful tool for suggesting directions for future research
- Can be used where it would be unethical or impractical to manipulate the variables involved.
- Produces precise information on the degree of relationship between the variables
Disadvantages;
- Cannot infer the direction of cause and effect
- There might be other unknown variables that can explain why the two variables are related.
Observations
Behaviour is in a natural setting where nothing has been changed either by the researcher or naturally. Ps are often unaware they are being studied and there is no IV.
Advantages;
- Ecological validity is very high as researcher has not changed the environment
- There are no demand characteristics as ps do not know they are being studied
- Can be used to generate ideas for or valadate findings from experimental studies
Disadvantages;
- Raises ethical issues as Ps are unaware of being studied so have no right to withdraw
- Lack of control over conditions makes replication more difficult
- Cannot legitimately infer cause and effect relationships between variables that are only obsevred but not manipulated
Case Studies
An ideographic method involving the in-depth study of an individual or particular group. They will often include a wide variety of qualative and quantative data gathering to provide a more discription of an individual.
Advantages;
- Highly detailed and indepth data is gathered
- Often the only method suitable for studying some types of behaviour
- Often the only method available due to rarity of behaviour
Disadvantages;
- Lack of genreralisability to the population due to single cases being to small and unrepresentative a sample
- Difficult or impossible to replicate
- No cause and effect can be legitamatly infered
Questionnaires
Written methods of gaining information from subjects and do not necessarily require the presence of a researcher.
Advantages;
- Collect large amounts of standadised data which is easily compared
- Quicker, more efficient and more convinient than other research methods
- Highly replicaple due to standadised questions
Disadvantages;
- Ps cannot ask for assistance if they do not understand a question
- Heavily subject to social desirability bias
- Lack flexability for P to explain answer
Interviews: Structured
A one-to-one conversation involving direct questioning of the P by the researcher. It contains fixed permeditated questions and ways of replying.
Advantages;
- Keeps conversation focused making comparison easier
- Reliable, replicable and easy to analyse
Disadvantages;
- Prevents the P for explaining their ideas fully
- Less validity - distorts/ignores data due to insensitivity
Interviews: Unstructured
A one-to-one conversation involving direct questioning of the P by the researcher. It may contain a topic area for discussion but no fixed questions.
Advantages;
- Allows Ps to explain themselves fully
- Extremely flexable, natural and un-constricted
- Highly detailed and valid data
Disadvantages;
- Very unstandardised, therefore, not very replicable, reliable or generalisable
- Difficult to quantify and analyse
- Difficult to keep P focused on subject matter
Interviews: Clinical
A one-to-one conversation involving direct questioning of the P by the researcher. Contains semi-structured guidelines but elaboration is allowed.
Advantages;
- Very flexable, sensitive and valid
- Fairly reliable and easy to analyse
Disadvantages;
- Flexability leads to more difficulty in replication and bias from the interviewer
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