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The χ2 goodness-of-fit test is a good alternative for the binomial test when there are only two categories and a large number of observations.
Pain-controlling Chemicals
Substances produced by the body, or administered externally, that can reduce or block the sensation of pain.
Endorphins
Biochemicals produced in the brain that act as natural painkillers and mood enhancers.
Androgens
A group of hormones that play a role in male traits and reproductive activity; present in both males and females.
Histamines
Compounds involved in local immune responses as well as regulating physiological function in the gut and acting as neurotransmitters.
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