In the section "Three Types of Needs," which of the following was NOT discussed by David McClelland?

In studying the effects of life-change on illness, some studies involved individuals who had experienced suspect stress related illness being asked to indicate when specific life changes and specific illnesses occurred. This type of study is generally called a:

a. cohort study b. retrospective study c. double blind study d. prospective study

By age 6, the average child has a vocabulary of around __________ words

a) 5,000 b) 9,000 c) 12,000 d) 14,000