People who are willing to take part in surveys usually have opinions and views that are different from those who decline to take part. This phenomenon is called:

Autism is estimated to occur in 1 out of every ____________ children, and it is

____________ likely to develop in boys than in girls. a. 166; 4 times more b. 166; 10 times more c. 2,000; 4 times more d. 220; 10 times less e. 220; 10 times more

According to the Highlight article, Freud asserted that ________ lay at the core of his patients' neurotic behavior

a. low self-esteem b. casual attitudes toward sex c. repressed sexual desires d. cultural bias