In an Experiment to Understand the Effects of Exercise on Heart

question 3

Multiple Choice

In an experiment to understand the effects of exercise on heart rate, a researcher varies the speed of a treadmill and then measures the heart rate of the participant. The heart rate of the participant is the _____.

• A) independent variable
• B) dependent variable
• C) placebo variable
• D) operational variable

---

Definitions:

Variable-Ratio

A reinforcement pattern in which a reaction is rewarded following a random number of responses, resulting in consistent and elevated rates of response.

Fixed-Ratio

A reinforcement schedule where a response is reinforced only after a specified number of responses have occurred.

Fixed-Interval

A reinforcement schedule in which the first reaction is reinforced after a predetermined period, resulting in a patterned series of responses.

Variable-Interval

A schedule of reinforcement where a response is rewarded after an unpredictable amount of time has passed.