Individuals Are Selected at Random for a Study from a List

question 43

Multiple Choice

Individuals are selected at random for a study from a list of members of Girl Scout troops to represent the population of girls aged 8-13. This sampling is ______.

• A) simple random sample
• B) stratified random sample
• C) haphazard/volunteer sample
• D) cluster sample

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Definitions:

Membrane Receptor

A specialized protein molecule embedded in the cell membrane that can interact with specific molecules, starting a chain of cell responses.

Depolarization

The process in which a cell's membrane potential becomes less negative, moving towards zero, which is critical in the initiation of action potentials.

Threshold Stimulus

Stimulus resulting in a local potential just large enough to reach threshold and produce an action potential.

All-Or-None Contraction

A principle stating that a nerve or muscle fiber responds completely or not at all to a stimulus once the stimulus reaches a threshold value.