Most people with anorexia nervosa
a) lose their appetite
b) lose their interest in food
c) lose both their appetite and interest in food
d) do not lose their appetite or interest in food
d
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You are watching a pigeon pecking a key for food reinforcement. The pigeon pecks at a very high, steady rate, but it also takes breaks from pecking each time food is delivered. Based on what is known about the pattern of responding produced by various schedules of reinforcement, you should conclude that the reinforcement schedule that is in place for this pigeon is a:
a. variable-ratio schedule b. fixed-interval schedule c. variable-interval schedule d. fixed-ratio schedule
Which organ is LEAST involved in the biology of the adolescent growth spurt?
a. Uterus b. Testes or ovaries c. Pituitary gland d. Hypothalamus
A group of randomly selected subjects for study that matches the population on important characteristics such as age and sex is called __________
a) volunteer bias. b) a representative sample. c) the experimental group. d) the control group.
Three-year-old Sasha makes a structure out of toy blocks. Sasha is engaging in __________ play
A) make-believe B) parallel C) constructive D) functional