The Scatterplot Shown Below Represents a Typical Shape of a Cubic

question 30

Multiple Choice

The scatterplot shown below represents a typical shape of a cubic regression model y = β₀ + β₁x + β₂x² + β₃x³ + ε. Which of the following is true about values of the regression coefficients?

• A) β₁ > 0; β₂ > 0; β₃ > 0
• B) β₁ < 0; β₂ > 0; β₃ > 0
• C) β₁ < 0; β₂ < 0; β₃ > 0
• D) β₁ > 0; β₂ < 0; β₃ > 0

---

Definitions:

Lung Capacity

The total volume of air that the lungs can hold, varying with health, age, and physical fitness.

Lose Elasticity

The process by which tissues become less flexible and stretchable over time, often due to aging or damage.

Lung Volume

The total amount of air that the lungs can hold, varying according to age, fitness level, and respiratory health.

Inspiratory Lung Capacity

The maximum volume of air an individual can inhale after a normal exhalation.