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:

Semicircular Canals

Part of the inner ear involved in maintaining balance and sensing rotation of the head.

Motion

The action or process of moving or being moved, involving change in position or location.

Planes

Flat, two-dimensional surfaces that extend infinitely, or a reference to different levels or areas of thought, existence, or development.

Proximity

The physical or psychological closeness between people, objects, or ideas, which can influence their interaction and relationship.