Asked by Psy Help

A researcher is measuring the heart rate of subjects as an index of anxiety. In this study, heart rate is
1) negatively correlated with anxiety
2) an independent variable
3) an operational definition of anxiety
4) a confounded variable

i think its number 3 or 4 is that right
Answered by bobpursley
It is not a confounding variable.
Answered by Psy Help
Is it number 1??
Answered by Writeacher
You said 3 or 4. It's clearly not 4, so what's your other considered choice?

??
Answered by sool
Actually i think the answer is 1. Is that correct?
Answered by PsyDAG
The heart rate typically <I>increases</I> 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.