The Strength of a Cluster Can Be Measured by Comparing

question 22

Multiple Choice

The strength of a cluster can be measured by comparing the average distance in a cluster to the distance between cluster centroids. One rule of thumb is that the ratio for between-cluster distance to within-cluster distance should exceed what value for useful clusters?

• A)0.5
• B)1
• C)1.5
• D)2

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Definitions:

Parasympathetic Nervous System

A branch of the autonomic nervous system that conserves energy by slowing the heart rate, increasing intestinal and gland activity, and relaxing sphincter muscles in the gastrointestinal tract.

Somatic Nervous System

The part of the peripheral nervous system associated with voluntary control of body movements through the action of skeletal muscles.

Sympathetic Nervous System

A branch of the autonomic nervous system that activates what is often termed the fight or flight response.

Cerebellum

A region of the brain that plays a vital role in motor control, and it may also be involved in some cognitive functions.