Research methods Flashcards
(111 cards)
Define the aim of a study
statement of what the researcher intends to find out
What are standardised procedures?
procedures that are the same for each participant- makes the study repeatable
What is operationalisation?
ensuring that variables can be specifically tested
What is a confounding variable?
a variable other than the IV that may affect the DV – these cannot always be controlled – changes in the DV might be due to a confounding variable rather than the IV
What is an extraneous variable?
Does not act as an alternative to the IV but may impact the IV.
What is mundane realism?
The extent of which a study mirrors the real world
What is a confederate
Someone who has been instructed to act a certain way within a study and the participant does not know they are not a real participant
What is an alternative hypothesis?
the opposite of a null hypothesis, can be directional or non directional and states a difference/ relationship between conditions/ groups of Ps
What is a null hypothesis
the opposite of an alternate hypothesis, stating that there is no difference/ relationship between conditions/ groups of Pss
What is a pilot study?
a small scale, trial run of a study to test aspects such as ethics and methodology, with a view to making improvements – the results are irrelevant
What is a lab experiment?
Pros and cons?
controlled setting, usually artificial; researcher directly manipulating the IV and measuring the DV
High control over extraneous variables; study cause and effect; easy to replicate; scientific.
Often low mundane realism; low ecological validity; Pss usually know they are being tested and so demand characteristics might occur
What is a field experiment?
Pros and cons?
conducted in a more natural setting; researcher directly manipulates the IV and measures the DV
Less artificial than a lab experiment; Pss may not be aware they are being studied – reduces demand characteristics
Less control of extraneous variables so lower internal validity; more time consuming and expensive than lab experiments
What is a natural experiment?
researcher does not manipulate the IV – this change would occur even if the study was not happening – researcher records effect on DV
allows research where IV cannot be manipulated for ethical or practical reasons; can study real life issues as
IV is naturally occurring\
cannot establish cause and effect as IV not being manipulated
What is a quasi experiment?
Research where the IV occurs naturally and the DV is measured.
Allows for comparisons between types of people
Cannot establish cause and effect and IV not being directly manipulated
Name the three types of experimental design
-repeated measures
-matched pairs
-independant groups
Name the four types of experiment
lab
field
natural
quasi
what are repeated measures?
pros and cons?
Experiments when participants experience each condition
Order effects may apply which affect Ps’s ability to work out the aim of the study – demand characteristics
What are independent groups?
Experiments where a group of participants only experience one condition of the IV
Cannot control Ps variables
Need more Pss than repeated measures to end up with the same amount of data
No order effects
What are matched pairs?
Two groups of Ps that are matched on characteristics
Can’t match P’s on all characteristics
Increased validity because results less likely to be due to one individual who is weird
How can you deal with the limitations of experimental design?
- Counterbalancing:
ABBA method (Ps experience both conditions but in varying orders) reduces bias of repeated measures
-Random allocation:
reduces bias of independant groups
What is opportunistic sampling?
pros and cons?
recruit Ps who are most convenient to you
less time consuming
Bias as Ps drawn from small % of population
What is stratified sampling?
pros and cons
sample is representative of subgroups in population
Representative as proportional to population
Time consuming
What is systematic sampling?
Pros and cons?
selecting every nth Ps from sampling frame
Unbiased – objective system
time consuming – need list of all of population
What is a volunteer sample?
pros and cons?
advertise for Ps in a newspaper/ noticeboard
Willing to Ps – no coercion
Volunteer bias – may be more highly motivated or share certain characteristics that might affect results