The Pearson Correlation Is Calculated for a Sample of N

question 31

Multiple Choice

The Pearson correlation is calculated for a sample of n = 20 individuals.If a hypothesis test is used to determine whether the correlation is significant,what df value would be used for the t statistic?

• A)18
• B)19
• C)20
• D)21

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Definitions:

NREM Sleep

Non-Rapid Eye Movement sleep, characterized by slower brain waves, which is divided into three stages and accounts for 75-80% of total sleep time.

Ascending Fibres

Nerve fibers that carry information from the body's sensory receptors upward to the brain, particularly pertinent to the sensory pathways.

Reticular Activating System

A network of neurons located in the brainstem that plays a central role in regulating wakefulness and sleep-wake transitions.

REM Sleep

A stage of sleep characterized by rapid eye movement, vivid dreams, and increased brain activity.