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A researcher is measuring the heart rate of subjects as an index of anxiety. in this study, heart rate is select one:
a. a confounded variable.
b. negatively correlated with anxiety.
c. an operational definition of anxiety.
d. an independent variable.

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W0lf93
Answer: b As anxiety increases, so does the heart rate. This is the body's natural response to danger. Anxiety increase the force of each beat and elevates the heart rate. When anxiety decreases, so does the heart rate. In this way the heart rate is an accurate index or measure of the anxiety a person is experiencing.

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