A Group of 10 Students Participated in a Study of Nutritional

question 45

Short Answer

A group of 10 students participated in a study of nutritional awareness.What is the sample variance $\left(S_{X}^{2}\right)$ of their scores?
20, 19, 22, 20, 15, 18, 15, 21, 19, 20

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Definitions:

Leptin

is a hormone produced by fat cells that regulates food intake and energy expenditure by signaling satiety to the brain.

Growth Factors

Natural substances capable of stimulating cellular growth, proliferation, healing, and cellular differentiation.

Melatonin

A hormone produced by the pineal gland that regulates sleep cycles.

Pineal Gland

Gland—either at the skin surface (fish, amphibians) or in the third ventricle of the brain (mammals)—that produces melatonin.