To ensure that subjects know what they are getting into when they sign up for a study, researchers must obtain:

An example of intrinsic motivation is reading a textbook because:

a. you want to earn an A on a test. b. you want to avoid a D or F. c. you enjoy reading it. d. you are being paid to read it.

Eight-year-old Goran immigrates to the United States with his family. About how long will it take Croatian-speaking Goran to attain speaking and writing skills in English on a par with his English-speaking agemates?

A) 1 to 2 years B) 3 to 5 years C) 5 to 7 years D) until he is an adult