00:01
A new york city test used in the recruitment of firefighters seemed to disproportionately exclude african americans and hispanics from the fire service.
00:10
What kind of validity was at issue? so there are different types of validity.
00:16
The main two that you might find are internal and external.
00:24
So internal validity is the ability of your test to measure what it claims to measure.
00:30
So the ability of a test to measure what it intends to.
00:41
So in this case that might be the suitability of a candidate for the fire service.
00:48
So that could be impaired.
00:50
If they are excluding african americans and hispanics for some reason that is not directly related to their ability to fight fires, that would be a failure of internal validity.
01:01
But we haven't been told what was going wrong here.
01:06
External validity is the ability for you to take your test results and apply them to other things.
01:14
Or if you have a study, the external validity is the ability to apply the study's results to other things as well.
01:20
So it's the ability to extrapolate to other situations...