Data collection methods Flashcards
laboratory experiment strengths
control experimenter has over research variables
high internal validity
laboratory experiment weakness
low ecological validity
IV or DV may be operationalised lack mundane realism
field experiment strength
more natural
like everyday life compared to laboratory experiment
field experiment weakness
difficult to control extraneous variables
MAJOR ethical issue- difficult to debrief participants if they don’t know there being studied- manipulation
natural experiment strength
allows research where IV can’t be manipulated
enables study of ‘real problems’ — increased mundane realism and ecological validity
natural experiment weakness
cannot demonstrate casual relationship as IV not directly manipulated
random allocation not possible may lead to confounding variables
confounding variable
a ‘extra’ variable that can ruin experiment and bring useless results
Quasi- experiment
contains a naturally occurring IV- difference between people that already exists
shares similarities with the traditional experimental design or randomised controlled trial
quasi experiment strength
allows comparisons between types of people
quasi experiment weakness
participants may be aware they are being studied
DV may be a artificial task reducing ecological validity
Independent variable meaning
input variable that is manipulated
Dependent variable meaning
responds to the IV it is what you measure and what is affected in experiment
Observational techniques types
- naturalistic
- controlled
- covert
- overt
naturalistic observation strength
realistic picture of spontaneous behaviour
high ecological validity
naturalistic observation weakness
little control over what happens in experiment- extraneous variables