We estimate the unknown standard deviation for 
by the _________ .
Definitions:
Individually
Acting or considered as a separate entity, distinct from a group or collectivity.
Developmental Quotient
A measure used in child development to compare a child's developmental progress in several areas against typical norms.
Gesell Scale
A developmental screening tool used to assess the motor, language, adaptive, and personal-social skills of children.
Stanford-Binet
A cognitive ability assessment test that measures intelligence across five factors: fluid reasoning, knowledge, quantitative reasoning, visual-spatial processing, and working memory.
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