The Least Squares Method Requires That the Variance $$\sigma _ { \varepsilon } ^ { 2 }$$

question 87

Multiple Choice

The least squares method requires that the variance $$\sigma _ { \varepsilon } ^ { 2 }$$ of the error variable ${ \varepsilon }$ is a constant no matter what the value of x is. When this requirement is violated, the condition is called:

• A) multicollinearity.
• B) heteroscedasticity.
• C) homoscedasticity.
• D) autocorrelation.

---

Definitions:

Magnetic Resonance Imaging (MRI)

A non-invasive imaging technology that produces three-dimensional detailed anatomical images using strong magnetic fields and radio waves.

Transcranial Magnetic Stimulation (TMS)

A noninvasive method used to stimulate small regions of the brain using magnetic fields, often used in treating depression.

Spinal Cord

A long, thin, tubular structure made up of nervous tissue that extends from the medulla oblongata in the brain down to the lower back, acting as a major part of the central nervous system.

Brain

The organ located in the head of humans and other vertebrates that is the central hub for nervous system activity.