Research Methods : Methodologies Flashcards
Independent variable
The variable the researcher manipulates in order to determine its effect on the dependent variable.
To provide a standard to compare experimental conditions with, there may be a control condition where the IV is not manipulated at all.
The dependent variable
This is the variable that is being measured. The IV and DV should be operationalised.
Operationalisation is defining the variables in such a way as to make them measurable.
Extraneous variables
These are any variables other than the IV that could affect the DV
Confounding Variables
These are any variables other than the IV that have affected the DV
Lab experiments
Carried out in a controlled environment, allowing researcher to exert a high level of control over IV and eliminate any EV.
Pps are randomly allocated to a condition. This means neither experimenter nor participant decides which condition the pps is placed in.
An unpredictable method (such as flipping coin/drawing names) is used to decide.
Advantages of Lab Experiments
-High level of control means it is easy to control for any EV and stop them becoming CV
- Can establish cause and effect relationship between IV and DV as researcher can manipulate IV
- Well controlled lab experiment can be easily replicated by other researchers to see if similar results can be obtained. If findings are similar in replicated, results are not due to chance or CV
Disadvantages of lab studies
- Strong chance of demand characteristics
- By establishing high level of control over IV and EV, experimental situation can lack mundane realism. This means study lacks ecological validity.
Mundane realism
The extent to which an experiment reflects real life
Ecological validity
Ability to generalise findings of research to the real world
Field experiments
Carried out in the real world. IV is manipulated by researcher to see effect on DV.
Advantages of field experiments
- More mundane realism and ecological validity than in a laboratory
- Because researcher can manipulate IV, cause and effect relationship can be established between IV and DV
- Less chance of demand characteristics because in a field experiment pps may not even be aware they are taking part in research
Disadvantages of field experiments
- There is much less control over EV and so the effect on the DV may not be caused by the IV but by these EV. This means the research is not valid.
- There is less control over the sample.
- Field experiments may be far more difficult to replicate.
Natural experiments
The researcher takes advantage of a naturally occurring IV to see its effect on the DV.
Advantages of natural experiments
- High level of mundane realism and ecological validity
- Very useful when it is impossible or unethical to manipulate the IV/sample in a laboratory experiment or field experiment
Disadvantages of natural experiments
- Less control over EV
- Difficult to replicate
- Far more difficult to determine cause and effect
Quasi experiments
Contain a naturally occurring IV. However, in a quasi experiment the naturally occurring IV is a difference between people that already exists (i.e. gender or age). The researcher examines the effect of this variable on the DV.
Observations
An observation is when a researcher watches or listens to participants engaging in the behaviour that is being studied.
Types of observations
Non-participant observation
Participant observation
Covert observation
Overt observation
Non-participant observation
This is when the researcher does not get directly involved with the interactions of the participants
Participant observation
This is when the researcher is directly involved with the interactions of the participants
Covert observation
The psychologist goes undercover and does not reveal their true identity, they may even give himself or herself a new identity. The group does not know that they are being observed.
Overt observation
The researcher watches and records the behaviour of a group that knows it is being observed by a psychologist.
Naturalistic observation
A researcher observes participants in their own environment and there is no deliberate manipulation of the independent variable (IV).
Advantages of naturalistic observations
- Pps are usually unaware that they are being observed (covert observation) so there is a reduced chance of observer effects.
- High mundane realism and ecological validity
- Useful when the deliberate manipulation of variables would be impractical or unethical