For the repeated-measures analysis, the F-ratio, on average, is expected to be zero when H0 is true

As children with ADHD become adolescents and adults,

A) those with hyperactivity tend to get worse, the rest get better. B) most get worse. C) they outgrow their ADHD symptoms. D) many continue to experience symptoms.

Which of the following is NOT a reason that African-American children have historically scored an average of 15 points lower than European-American children?

a. genetic heritage of each group b. unequal education c. African Americans, as a group, more likely to be impoverished d. minority groups' valuing practical intelligence over the analytic intelligence predicted by IQ tests