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List and describe four types of randomized sampling techniques.
Headache
A pain or discomfort in the head, scalp, or neck, often associated with tension, migraine, or other health issues.
Independent Variable
The variable that is manipulated by the researcher to observe its effect on the dependent variable.
Loudness
A subjective perception of the intensity of sound, often measured in decibels, that impacts how sound is experienced.
Noise
Unwanted sound that is loud, unpleasant, or causes disturbance.
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