Children with imaginary companions: (Multiple Choice)

Children with imaginary companions:
 
  a. are more aggressive than those without such companions.
  b. are less cooperative than those without such companions.
  c. have fewer real friends than those without such companions.
  d. show greater ability to concentrate and more advanced language development.

Question 2

The purpose of having random assignment in an experiment is to:
 
  a. prevent subjects from knowing of which experimental group they are a member.
  b. provide ethical reasons for being in an experiment .
  c. make sure that no pre-existing differences among groups caused the change in the experimental group's behavior.
  d. cause a selection factor to determine how the subjects will behave in the experiment.

Question 3

Which of the following is true about imaginary friends?
 
  a. They are a sign of serious pathology.
  b. They are extremely rare.
  c. As many as 65 percent of preschoolers have them.
  d. They are more common in later-born children.