What percentage of American toddlers were toilet trained by 18 months, according to a study completed in 1957?

The central element of the assessment process is __________.

A. a physical examination B. an assessment of the global level of functioning C. the administration of the MMPI D. a clinical interview

In ____________ conditioning, a response is elicited by an antecedent stimulus, and conditioning involves the pairing of two stimuli

a. operant b. respondent c. instrumental d. none of these