Examlex
When using the t test to test a hypothesis about a population mean with an unknown population standard deviation ( )the degrees of freedom is defined as n - 1.
Preschoolers
Children who are approximately 3 to 5 years old, often characterized by rapid development in language, motor skills, and social understanding.
24-hour Period
A full day; the time it takes for the Earth to complete one rotation on its axis, comprising day and night.
Sleep Terrors
A sleep disorder involving intense fear, screaming, and flailing while asleep, often without waking fully.
Rapid-eye-movement Sleep
A phase of sleep characterized by rapid movements of the eyes, low muscle tone throughout the body, and the propensity of the sleeper to dream vividly.
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