An experiment is being conducted to determine the effects of caffeine intake on student performance. One group is made to drink 5 cups of coffee, the other group drinks 1 cup of coffee. They then take the exam. The independent variable is ________
a. the amount of caffeine consumed.
b. the group membership.
c. how alert the students are during the exam.
d. the students' performance on the exam.
A
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A Yugoslavian study (2000) examining the effects of lead exposure in children found that the children who lived near the smelter
a. had somewhat lower intelligence scores. b. had significantly lower intelligence scores. c. had higher rates of aggressive behavior. d. had delayed motor development.
Experiments can determine cause-and-effect relationships with the effects being measured by the __________variable
a. extraneous b. independent c. correlational d. dependent
Efferent spinal nerves arise from the _________ root of the spinal cord and carry ___________ information
a. ventral; sensory b. ventral; motor c. dorsal; sensory d. dorsal; motor
Abusers of which drug have one of the highest relapse rates for any category of illicit or licit drug abuse?
a) Methamphetamin b) Cocaine c) Ephedrine d) Amphetamine