Examlex
Which source of error variance affects parallel- or alternate-form reliability estimates but does not affect test-retest estimates?
Random Sample
A method of selecting individuals from a population where each has an equal chance of being chosen, ensuring the sample's representativeness.
Preoperational Stage
The second stage in Piaget's theory of cognitive development, where children aged 2-7 years begin to think symbolically but are not yet able to perform operations, or reversible mental actions.
Understanding
The ability to grasp the meaning, significance, or nature of something, often involving comprehension of concepts and relationships.
Sisters
Female siblings who share one or both parents in common.
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