A design in which a single group of subjects is measured repeatedly before and after a treatment is a _____ design

High school sex-education classes:

A) are controversial around the world. B) encourage teens to have intercourse. C) provide consistent information. D) are highly relevant to teenager's concerns.

What is the main message concerning the use of computers according to Stoll?

a. Only use them if you have to, and then be cautious. b. Computers increase our sense of freedom. c. Computers are useful unless they seduce us away from real experiences. d. Computers are the source of our social problems.