Exhibit 15-5

question 55

Multiple Choice

Exhibit 15-5.The accompanying table shows the regression results when estimating . Refer to Exhibit 15-5.At the 5% significance level,which explanatory variable(s) is(are) individually significant?

• A)Only x₁
• B)Only x₃
• C)x₁ and x₂
• D)x₂ and x₃

---

Definitions:

Brain

The organ of the central nervous system located in the skull, responsible for coordinating sensory information and directing motor responses; also the center of thought and emotion.

Myxedema

A condition resulting from the hypofunction of the thyroid gland.

Thyroid Hormone

Hormones produced by the thyroid gland, important for regulation of metabolism, energy generation, and neuromuscular function.

Pituitary Hormone

Hormones secreted by the pituitary gland, which is located at the base of the brain and plays a crucial role in regulating growth and metabolism, among other functions.