________ was the 1950s researcher who created a furor by claiming that psychotherapy does not work

Adolescents say that an attractive feature of oral sex is that

A) "You can do it and still be a virgin." B) "You won't get pregnant from it." C) "You're less likely to catch a disease." D) All of the above.

Mitch has a research assistant that is not very socially adept. He notices that the participants of

this research assistant provide different data when interviewed than the participants of other assistants. This validity threat is known as __________. Fill in the blanks with correct word