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A cardiologist is studying the effects of soothing music on a person's heart rate.He records his patient's at-rest heart rate in whole beats per minute before and after they listen to soothing music.The variable "heart rate" in this study is BEST described as:
Profitability Index
A financial tool used to evaluate the attractiveness of an investment by dividing the present value of future cash flows by the initial investment cost.
Rate Of Return
The gain or loss of an investment over a specified period, expressed as a percentage of the investment’s cost.
Required Return
The lowest profit anticipated by an investor from a specific asset or project investment.
Profitability Index
A financial metric that calculates the relative profitability of an investment by dividing the present value of future cash flows by the initial investment cost.
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