A Circadian Rhythm

question 71

Multiple Choice

A circadian rhythm:

• A)Is about a day long
• B)Varies from 12-48 hours across individuals
• C)Alters alertness but has little effect on hormonal levels
• D)Is shorter than an ultradian rhythm

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Definitions:

Test Items

Questions or tasks designed to measure knowledge, skills, abilities, or other attributes.

Nonmanipulated Variables

Variables in a study that are not altered or controlled by the researcher but observed for their effects on the outcome.

Independent Variable

In experimental research, the variable that is manipulated by the researcher to observe its effects on the dependent variable.

Poor Reliability

Describes a measure or test that fails to produce consistent and stable results over time.