Are these rulers internally reliable? Externally reliable?
Here are the key RM terms that we've covered recently:
Reliability
Inter-observer reliability
Internal reliability
External reliability
Split-half method
Test-retest method
Internal validity
Investigator effects
Demand characteristics
Participant reactivity
Extraneous variables
Single-blind, double-blind techniques
Face validity
Concurrent validity
Predictive validity
Ecological validity
Population validity
Mundane realism
My powerpoints on reliability and validity are here and here. We'll start the stats next week, which is certainly a bit more interesting but is a bit trickier.
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