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A statewide sample survey is to be conducted. First,the state is subdivided into counties. Seven counties are selected at random,and further sampling is concentrated on these seven counties. What type of sampling is this?
Brain Activation
The process of increasing blood flow to different parts of the brain during various cognitive tasks, reflecting an increase in energy use by those brain regions.
Basic Emotion
Fundamental emotions that are universally experienced by humans, such as happiness, sadness, fear, disgust, anger, and surprise.
Arousal
A state of being physiologically alert and responsive to stimuli.
Context
The circumstances, background, or environment in which information is interpreted and understood, significantly affecting its meaning.
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