Which of the following statements about health care in the U.S. is true:
a. The infant mortality rate is among the lowest of any western nation.
b. Increasing numbers of cancer deaths are related to environmental hazards.
c. On average, people in the U.S. live longer than people in any other country in the world.
d. Because of technological advances in health care, the aging factor will be an insignificant issue in the coming decades.
ANS: b
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While participating in a lengthy experiment involving job training for welfare recipients, the economy enters into a major recession. Posttest measurements found that job training was unsuccessful in helping participants locate jobs. However, the experiment’s designers claim that the findings were inconclusive because of internal invalidity. Which of the following sources of internal invalidity would they be most likely to name as the problem?
a. Contamination b. Secular drift c. Selection bias d. Reactivity e. Compensatory rivalry
What is the slope?
A. –1.2
B. 0
C. 1.2
D. 5
The simplest way to define the term "system" is:
A. Human beings B. Theoretical framework C. A whole consisting of interacting parts D. The family
If the goal of a group is the simulation of everyday life, then it is a good idea to have
A) ?a homogeneous group. B) ?a heterogeneous group. C) ?an endogenous group. D) ?an androgynous group.