Professor Karney Administered a Psychological Test Measuring Shyness to a Large

question 9

Multiple Choice

Professor Karney administered a psychological test measuring shyness to a large number of undergraduate students. The students also completed a lengthy questionnaire on their social life and activities, including number of friends. Professor Karney conducted a statistical analysis of the responses and found a correlation coefficient of -.80 between level of shyness and number of friends. This indicates that:

• A)as number of friends increases, level of shyness increases.
• B)as number of friends decreases, level of shyness increases.
• C)there is no relationship between level of shyness and number of friends.
• D)a cause-and-effect relationship exists between shyness and number of friends.

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Definitions:

Schizophrenia

A severe mental disorder characterized by disturbances in thought, perception, and behavior, manifesting in symptoms like hallucinations and delusions.

Dopamine

A neurotransmitter involved in regulating mood, motivation, and reward, among other functions.

Parkinson Disease

A neurodegenerative disorder affecting movement, often characterized by tremors, stiffness, and balance difficulties.

Glutamate

An important neurotransmitter in the brain involved in learning and memory, acting as a key excitatory molecule in the central nervous system.