Scientists arbitrarily set the limit for _____ as stimulation that can be detected 50 percent of the time

Stranger anxiety is positively correlated with

A. feelings of security. B. unfamiliar settings. C. familiar settings. D. the age of the mother.

Chinas (1991) found that in Mexican culture this is considered to be reaching marriageable age:

A. 15 B. 16 C. 17 D. 18