Which of the following involves use of symbols?

Which of the following involves use of symbols?
 
  a. preoperational thought c. pretend play
  b. use of language d. all of these

Question 2

Dr. Manquero forms the hypothesis that ingesting chocolate prior to an exam will improve exam performance. She gives half of her participants chocolate and the other half gum. She then gives the participants an exam. In this experiment, what is the dependent variable?
 
  a. the group that chews gum c. the group that eats chocolate
  b. the performance on the exam d. whether they eat chocolate or chew gum

Question 3

Amanda has three siblings. Zora has two siblings and is the oldest child. Jackson is an only child. Which child/children are mostly likely to have imaginary friends?
 
  a. All three c. Jackson
  b. Zora d. Both Zora and Jackson

Question 4

Dr. Manquero forms the hypothesis that ingesting chocolate prior to an exam will improve exam performance. She gives half of her participants chocolate and the other half gum. She then gives the participants an exam. In this experiment, what is the experimental group?
 
  a. the group that chews gum c. the group that eats chocolate
  b. the performance on the exam d. There is no experimental group.

Question 5

Janice tells you that she is worried that her three-year-old has a pretend playmate. You tell her not to worry because as many as ______ percent of preschoolers have imaginary friends.
 
  a. 50 c. 75
  b. 65 d. 100

Question 6

A hypothesis is:
 
  a. only used in correlational research.
  b. tested with an experiment.
  c. always supported by the findings of an experiment.
  d. useless when comparing two equal groups of participants.

Question 7

Two-year-old Jared is pretending to stab his sister's doll. What is the best statement about that type of pretend play?
 
  a. It is nothing to worry about.
  b. Jared may engage in antisocial behavior later.
  c. Jared is showing a lack of empathy.
  d. Both b and c are correct.