About three months after conception, anti- Müllerian hormone
a. promotes the development of the Wolffian system.
b. initiates the degeneration of the Wolffian system.
c. promotes the development of the Müllerian system.
d. initiates the degeneration of the Müllerian system.
d
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Which of the following statements on infant social interactions is TRUE?
A) Infants are able to play by imitating each other's actions at about six months of age. B) Differences in temperament rarely contribute to infants' interaction style. C) Infants vary greatly in social responsiveness. D) Infants begin to show interest in people their own size around the age of four months.
Limited autobiographical memory prior to age 5 is probably due to incomplete myelination of the _________________
a. reticular formation b. hippocampus c. corpus callosum d. Broca's area
Investigations of animal behaviors indicate that:
a. the actions of animals can be explained by instinct and by principles of operant conditioning alone. b. chimpanzees have a rudimentary sense of number and appear to have some sort of summing ability. c. humans are the only animals who can acquire behaviors from their parents. d. Many animals use species-specific languages to communicate.
A salesperson works for a car dealership for 40 hours per week, but may choose not to work hard all of the time. The dealership's owner cannot observe the salesperson's effort, but can observe the number of cars sold. The salesperson's personal cost of working at the dealership is C(H) = 1,200 + H2, where H is the number of hours during which he works hard. The corresponding marginal cost of effort is MC = 2H. Without any effort, the salesperson will, on average, generate a profit of $1,200. With each hour of high effort, he has a 5 percent chance of selling a car. Each car sale generates a profit of $900. What is the efficient number of hours of hard work?
A. 22.5 B. 20 C. 40 D. 27.5