RM-psy Flashcards
random sampling
when the target pop has an equal chance of being chosen eg names out of a hat
S/W of random sampling
unbiased/less willing to participate
opportunity sampling
selecting people available at the time eg approaching people in public
S/W of opportunity sampling
quick cheap/unrepresentative
volunteer sampling
ps volunteer themselves to be in a study eg through an advert
S/W of volunteer sampling
ps less likely to withdraw/time consuming (having to wait)
snowball sampling
ask ps to nominate people similar to themselves to be sampled
S/W of snowball sampling
find unique characteristics faster/time consuming
research design?
independent measures/repeated measures/matched pairs
research methods?
lab/field/quasi
S/W of self reports
quick easy to fund/interpreter bias
S/W of experiments
high levels of repeatability/lacks ecological validity
S/W of correlations
good to use when ethics are an issue/cant always find cause and effect
S/W of observations
high ecological validity/hard to replicate (high levels of extraneous variables
positive correlation
/
negative correlation
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interval def, S/W
data that uses standardised scale eg measuring height S detailed data W none
ordinal data def, S/W
data put into order or rate eg rating scales S can see range W mean cant be used to analyse data
nominal data def, S/W
categories of behaviour with nominal level eg closed question responses S easy to analyse W limited detail
validity=accuracy (internal def)
measuring what it intends to
external validity
is the study measuring what it intends to beyond the current study
threats to validity
observer bias researcher bias demand characteristics response bias
reliability
is the results consistent
is this a waste of time?
yes
