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For an independent variable Y, the error associated with the ith observation is:
Vitamin Supplements
Products containing vitamins that are taken to supplement the diet and ensure adequate nutrient intake.
Caffeine
A stimulant to the central nervous system that is the most widely consumed psychoactive substance in the world, commonly found in coffee, tea, soft drinks, and chocolate.
Melatonin
A hormone produced by the pineal gland in the brain, responsible for regulating sleep and wakefulness patterns.
Insomnia
A persistent disorder that impairs the ability to fall asleep or maintain sleep, affecting one's overall health and quality of life.
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