Posted by Psy Help on Wednesday, December 19, 2007 at 8:07pm.
It is not a confounding variable.
Is it number 1??
You said 3 or 4. It's clearly not 4, so what's your other considered choice?
??
Actually i think the answer is 1. Is that correct?
The heart rate typically increases with the anxiety level, so it can be used as an operational definition of anxiety. (It is one of the indicators used in the lie detector.)
See http://en.wikipedia.org/wiki/Operational_definition
I hope this helps a little more. Thanks for asking.
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