Forced Expiratory Volume (FEV) Is the Volume of Exhaled Air

question 27

Multiple Choice

Forced expiratory volume (FEV) is the volume of exhaled air and is related to lung size as well as lung function. It is typically lower in persons with impaired lung function due to disease. A regression of height (in inches) on FEV (in liters) showed a nonlinear pattern. Therefore, height was regressed on log(FEV) (natural log) and the residual plot showed a much improved fit. The intercept a and slope b from the regression of height on log(FEV) are a = -2.2 and b = 0.06. The correlation for this regression is:

• A)positive.
• B)negative.
• C)zero.
• D)There is not enough information to determine the answer.

---

Definitions:

Operations

Daily operational tasks of a business aimed at creating value for its stakeholders.

Return on Investment

A measure of the profitability of an investment, calculated as the net income from the investment divided by the cost of the investment.

Residual Income

Income that continues to be generated after the initial effort or investment has been completed, often used in the context of investments or intellectual property.

Net Operating Income

A measure of a company's profitability from its ordinary, core operations, excluding expenses and incomes from financing and investing activities.