Research Methods Flashcards
(203 cards)
Sampling techniques
what is a Target population?
the target population is the particular subgroup that the psychologist is interested in studying, and to which the research findings will be generalised
what is a sample?
small group from the population. needs to be representative of the target population
Why do we need to use sampling methiods?
the target population is too large to study, so sampling techniques allow the psychologist to pick a sample that can represent the target population. If the sample is representative then psychologists can generalise the results to the target population with more credibility
what is random sampling?
how would we go about this?
- everyone has an equal chance of being chosen
- list of all members of the target population
- all names given a number
- samle is selected through lottery method?
what is an advantage and disadvantage of random sampling?
adv: Free from bias, so more likely to be representative of the population, can be generalised to target population
Disadv: time consuming, those who are picked may be unwilling to take part
how is a random sample different to random allocation?
random allocation involves eliminating researcher bias
what is systematic sampling?
how?
- choosing people according to a (pre-determined) system
- we can pick every 5th person or 3rd house on the street
what is an advantage and disadvantage of systematic sampling?
adv: Free from bias
Disadv: may not be representative of the target population
what is stratified sampling?
how?
this sample reflects the proportions of people that make up the total populations
- identifies the group that makes up the target population
- work out proportions needed for the sample to be representative
- participants that make up each group are selected using random sampling
what is an advantage and disadvantage of stratified sampling?
Adv: ubias, likely to be representative
Disav: time consuming
what is opportunity sampling?
researcher selects anyone willing to participate in study at time
e.g If stood outside of university in street - uni students
what is an advantage and disadvantage of opportunity sampling?
Adv: convenient, quic, easy, cheap
Diadv: Could be bias as researcher picks their participants.
What is volunteer sampling?
- participants select themselves to be part of the sample.
- via advert in newspaper or on social media
what is an advanatage and disadvantage of volunteer sampling?
Adv: quick and easy
Diadv: issues of bias, not representative of target population
Ethical Issues
what are ethical issues?
this arises when conflicts exist between participants rights in research studies
what is the BPS code of ethics?
a legal document that instructs psychologits in the UK about what behaviour is and not acceptable when dealing with participants
what are the 4 ethical issues?
informed consent, deception, right to withdraw and privacy and confidentiality
what is informed consent?
- ensures participants are aware of all the aims, procedures, their rights and what their data will be used for
why might some researchers may not want to ask for consent?
because it could make the study meaningless because participants behaviour will not be natural as they know the aims of the study
How can we obtain informed consent?
- presumptive consent - a similar group of people are asked if the study is acceptable, if this group consents then the original participants is presumed
- prior general consent - participants give consent to take part in a numerous of studies including deception
- retrospective consent - are asked for conset after taking part in the study. may not have been aware of deception
How do we deal with informed consent?
- consent letter with relevant information
- if under 16, parents signiture needed
what is deception? And why is it unethical?
- deliberately misleading and holding information from participants ant any stage of the investigation.
- This is unethical as participants have not given fully informed consent which means they might be taking part in research that goes against their beliefs