Exhibit 11-8 
-Which of the following has a chi-square distribution?
Definitions:
Cortisol Levels
The concentration of cortisol, a stress hormone, in the blood, which can affect various body functions.
Narcolepsy
A chronic sleep disorder characterized by overwhelming daytime drowsiness and sudden attacks of sleep.
Sleep
A naturally recurring state of mind and body characterized by altered consciousness, relatively inhibited sensory activity, reduced muscle activity, and inhibition of nearly all voluntary muscles during rapid eye movement (REM) and non-REM stages.
NREM Sleep
A type of sleep characterized by non-rapid eye movement, encompassing stages 1-3 of the sleep cycle.
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