6. Research methods key words Flashcards
Experimental method
Involves manipulation of am independent variable to measure the effect on the dependent variable
Aim
a general statement of what a researcher intends to investigate and the purpose of the study
Hypothesis
a clear and testable statement stating the relationship between the variables to be investigated. Stated at the beginning of the study
Directional hypothesis
States the direction of the results (the difference or relationship)
Non-directional hypothesis
doesn’t state the direction in which the results will go
Variables
Any ‘thing’ that change within an investigation
Independent variable
the aspect of the investigation that is manipulated by the researcher, the effect of this on the DV is what is measured
Dependent variable
the aspect of the investigation that is measured by the researcher. It should only be affected by the IV
Operationalisation
clearly defining variables in terms of how they can be measured
Extraneous variable
Any variable that may get in between the IV and the DV. they are also called nuisance variables and don’t vary systematically with the IV.
Confounding variables
Any variable that can affect the DV in the same way that the IV can so we can’t identify the true cause of the change. These vary systematically with the IV
Demand characteristics
Any cue given from the researcher that gives away the true nature of the investigation. This may change the participants behaviour and result in the please-U or screw-U effect.
Investigator effects
any effect of the behaviour of the researcher on the research out come (the DV). Including: design of study, participant selection and interaction with them.
Randomisation
the use of chance in order to control researcher bias when designing an investigation
Standardisation
Using the same, formalised procedures and instructions for each participant
Population
a group of people who are the focus of the researcher’s interests, from which the sample is chosen.
Sample
a group of people chosen from the target population for the investigation. It is supposedly representative of the population and is chosen using ‘fair’ methods
Sampling techniques
the method used to select people from the population
Bias
This limits the extent to which a sample can be generalised to the whole population as some groups might become over or under represented.
Generalisation
the extent to which findings from an investigation can be broadly applied to the population. Therefore the sample has to be representative of the population
Ethical issues
These arise when there is a conflict between the rights of participants and the goals of the researcher to make the results valid and authentic
BPS code of conduct
The quasi-legal document produced by the British Psychological society that instructs psychologists about what behaviour is and isn’t acceptable. It’s built around four key principles: respect, competence, responsibility and integrity
Experimental designs
the different ways in which the testing of participants can be organised in relation to the experimental condition
Independent Groups Design (IDG)
Participants allocated to different groups where each group represents one experimental condition
Repeated Measures Design (RMD)
All participants take part in all conditions of the experiment
Matched Pairs Design (MPD)
Pairs of participants are first matched on some variables that may affect the DV. Then one member of each group is assigned to condition A and the other to condition B.