A Sample of 20 Items from a Population with an Unknown

question 76

Multiple Choice

A sample of 20 items from a population with an unknown $\sigma$ is selected in order to develop an interval estimate of $\mu$ . Which of the following is not necessary?

• A)We must assume the population has a normal distribution.
• B)We must use a t distribution.
• C)Sample standard deviation must be used to estimate \(\sigma\).
• D)The sample must have a normal distribution.

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Definitions:

Gonadal

Relating to the gonads, the organs that produce gametes (sperm in males and ova in females) for reproduction.

Calcitonin

A hormone produced by the thyroid gland that lowers blood calcium levels by activating osteoblasts.

Thyroid Gland

An endocrine gland, consisting of irregularly spheroid follicles, lying in front and to the sides of the upper part of the trachea, in a horseshoe shape, with two lateral lobes connected by a narrow central portion, the isthmus; occasionally an elongated offshoot, the pyramidal lobe, passes upward from the isthmus in front of the trachea. It is supplied by branches from the external carotid and subclavian arteries, and its nerves are derived from the middle cervical and cervicothoracic ganglia of the sympathetic system. It secretes thyroid hormone and calcitonin.

Steroidal

Relating to or characterized by the presence of steroids, which are a large class of organic compounds with a characteristic molecular structure.