A child who understands the inversion principle understands that ___
a. the two sides of an equation are equal in value
b. adding and subtracting the same number leaves the original quantity unchanged
c. the answer of an addition problem is the same, regardless of the order in which the addends are added
d. none of the above
B
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Examination of the cumulative record of responses of an experimental animal reveals a horizontal line that represents responses across the last seventy experimental sessions
What would you conclude about the animal's responses based on this cumulative record? a) The animal learned the task quickly. b) The response has been extinguished. c) Spontaneous recovery had been demonstrated. d) A fixed-ratio schedule of reinforcement was used.
Suppose you interview a group of people who were 12th graders in 2009
If you believe they represent a "typical" population of people growing up in the United States at this time, you would expect that about ____ of these students would have had sexual intercourse. a. 15% b. 33% c. 50% d. 67%