Helen decides to study the effects of alcohol on driving ability. She selects 200 college
students and randomly divides them into two groups of 100 students each.
Subjects in
group "A" drive a car through an obstacle course while remaining sober. Subjects in
group "B" also drive through the obstacle course, but they are given an ounce of
whiskey before each attempt at driving the course. As expected, the driving ability of
subjects in group "B" steadily deteriorates as they consume more alcohol. In Helen's
study, the subjects' driving ability is the ______.
a. independent variable c. dependent variable
b. codependent variable d. reciprocal variable
C
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Of twin pregnancies, how many of these are dizygotic twins?
a. One-half b. One-third c. Two-thirds d. One-fourth
Jesse is earning his Master's degree, and he is interested in having a career in which he will study population trends. Jesse is preparing for a career as a(n) ____
a. demographer b. psychometrician c. statistician d. ethnographer
Based on research with adopted children and twins, which statement is justifiable about the contribution of heredity to personality??
a. ?There are "personality genes" that determine certain personality traits. b. ?Identical twins that have been raised together have similar personality traits because of genetic factors. c. ?Birth order is one of the most important influences on personality. d. ?People inherit predispositions for certain personality factors.
The function of the neuron's axon is to ______
a. conduct electrical impulses toward other neurons b. regulate the neuron's life processes c. receive messages from neighboring neurons d. insulate against leakage of electrical impulses