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Multistage cluster sampling requires less prior information than stratified sampling.
Tertiary Circular Reactions
A stage in Piaget’s theory of cognitive development where toddlers (around 12 to 18 months) experiment with new actions to see the outcomes, demonstrating an early form of problem-solving.
Mental Representations
Internal cognitive symbols that represent external reality, which are used in the process of thinking and understanding the world.
Violation-of-Expectation
A method used in developmental psychology research to study infants' understanding of physical and social world by evaluating their reactions to surprising or unexpected events.
Stimulus
Something that causes a response in an organism, sensory system, or psychological process.
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