Posted by **Psy Help** on Wednesday, December 19, 2007 at 8:07pm.

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

- Psy -
**bobpursley**, Wednesday, December 19, 2007 at 8:14pm
It is not a confounding variable.

- Psy -
**Psy Help**, Wednesday, December 19, 2007 at 8:15pm
Is it number 1??

- Psy -
**Writeacher**, Wednesday, December 19, 2007 at 8:16pm
You said 3 or 4. It's clearly not 4, so what's your other considered choice?

??

- Psy -
**PsyDAG**, Thursday, December 20, 2007 at 10:48am
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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