Which statement is TRUE regarding caffeine?
a. ?It can lead to dependence.
b. ?It appears to have no important effects on prenatal development.
c. ?It interferes with problem solving, even in low doses.
d. ?It slows down reaction time, even in low doses.
ANSWER:
a
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Scientific theories must be subject to empirical scrutiny, that is to say, they must be ____________________
Fill in the blank(s) with correct word
Dee used to think that everyone else liked the same people she did and hated the same people she did. She now realizes that different people have different opinions toward others. Piaget would suggest that Dee has recently become a ____ thinker
a. preoperational b. formal operational c. concrete operational d. sensorimotor
In an experiment to study the effects of fertilizer on plants, the growth rate of the plants would be the __________ variable
a. dependent b. extraneous c. experimental d. independent
In a study of activity and leisure time in children from various countries, research has shown that
a. a typical U.S. child works more than four hours per day. b. U.S. children spend little discretionary time with friends. c. a typical U.S. child works less than half an hour per day. d. U.S. children spend more time on homework than do children from any another culture. e. free time for U.S. children has decreased over the last 20 years.