For a particular population, a sample of n = 4 scores has a standard error of 6 . For the same population, a sample of n = 16 scores would have a standard error of _____

Research on Head Start programs has shown that

A) improvements in IQ and school achievement last well into adolescence. B) one year's intervention is not a sufficient amount of time to boost children's IQ scores. C) its benefits in IQ and academic achievement often disappear during the first two to three years of elementary school. D) improvements in IQ test scores decline more rapidly for Mexican-American children than for African-American children.

Effective treatments for conduct disorder usually involve

a. removing the child from the environment that has fostered the maladaptive behavior. b. legal intervention. c. teaching the child basic moral lessons. d. parental participation.