Ethan must build 25 radios before he receives $20. What schedule of reinforcement is being used?

A. a variable-ratio schedule
B. a fixed-ratio schedule
C. a fixed-interval schedule
D. a continuous schedule

Answer: B

Psychology

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In middle childhood, what is one of the main reasons for ending a friendship?

a. differences in interests b. a betrayal of trust c. moving away from the neighborhood d. fighting or bickering over a member of the opposite sex

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The rules for understanding language are referred to as:

A) morphology. B) phonology. C) syntax. D) pragmatics.

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