In a study with three levels of factor A, three levels of factor B, and six participants in each condition, the df error would be

Cocaethylene

A. is a type of freebase cocaine that uses ether. B. was one of the popular patent medicines sold around 1900. C. is formed in the body when cocaine and alcohol are used together. D. is a precursor for cocaine production.

The study of __________ consists of examining the mental activities associated with sensation, perception, thinking, knowing, remembering, and communicating

a. psychophysics b. cognition c. psychology d. intelligence