RELIABILITY AND VALIDITY Flashcards
WHAT IS VALIDITY?
does the research measure what it should measure
what is reliability?
the consistency of results
how to improve internal validity of experiments?
assess and control extraneous variables
control group
how to improve external validity of experiments?
increase sample size and make more realistic
what is the different between internal and external validity?
The key difference between internal and external validity is that internal validity is the extent to which the researcher is able to make the claim that no other variables except the one he is studying caused the result whereas external validity is the extent to which results of a study can be generalized to the world at large.
how to improve internal validity of an observation?
double blind
trained observers
improve the quality of the BCS
how to improve external validity of an observation?
wider sample
repeat observation
how to improve reliability of an experiment?
standardised instructions
keep conditions the same
how to improve reliability of an observation?
check quality of the BCS
use trained observers
how to assess reliability of observation?
inter rater relibaility
what is inter-rater reliability?
1) ensure the BCS is established
2) conduct the observations independently
3) check the percentage similarity of results
4) if 80% + then they have IRR
5) plot data on a scatter graph
6) see if there’s a positive correlation
77) conduct stats tests for correlation statistic
how to improve reliability of observations?
check quality of BCS
use trained observers
how to assess internal reliability of self report techniques?
split half test
what is a split half test?
score on 1st half should be the same as the second half
how to assess external reliability of self report?
test-retest
