Time-Series Models May Exhibit Seasonal Effects or Cyclical Effects

question 4

Multiple Choice

Time-series models may exhibit seasonal effects or cyclical effects. A seasonal effect differs from a cyclical effect in that a seasonal effect:

• A) has no trend, is relatively constant, and only exhibits random behavior.
• B) describes ups and downs over a time frame such as several years.
• C) is one that repeats at fixed intervals of time, typically a year, month, week, or day.
• D) is based on analysis of historical time-series data and are predicated on the assumption that the future is an extrapolation of the past.

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Definitions:

Postcava

Another term for the inferior vena cava, the large vein that carries deoxygenated blood from the lower half of the body to the right atrium of the heart.

Precava

Often referred to as the superior vena cava, it is a large vein that carries deoxygenated blood from the upper body to the heart.

Internal Jugular Vein

A major vein that carries blood from the head, brain, face, and neck back towards the heart.

Axillary Vein

A large blood vessel that conveys blood from the lateral aspects of the thorax, armpit, and upper limb toward the heart.