Adolescents who have secure attachments with their parents have

Researchers estimate that the heritability for ADHD is as high as

A) .59. B) .69. C) .79. D) .89.

In a control group posttest only between subjects design, if you had 16 participants in each group, how many degrees of freedom would there be?

a. 16 c. 30 b. 32 d. 31