Which of the following statements about immunizations and young children is true?
A. In the United States, polio and pertussis largely persist because of limited access to vaccinations for these infections.
B. Vaccines only work if a high enough proportion of the population is inoculated.
C. In the United States, even poor children receive all the required shots and there are no regional differences in coverage.
D. The scientific community believes that infants receive too many vaccines for their immune system to handle safely.
Answer: B
You might also like to view...
What proportion of a normal distribution is located in the tail beyond z = –1.00?
a. 0.8413 c. –0.3413 b. 0.1587 d. –0.1587
What happens to the critical value for a chi-square test if the number of categories is increased?
a. The critical value increases. b. The critical value decreases. c. The critical value depends on the sample size, not the number of categories. d. The critical value is determined entirely by the alpha level.
The person with bulimia nervosa is at risk of ____
a. loss of sleep c. suicide b. personality disorders d. obesity
On a chemistry final, Dr. Curie asks Marie to describe the properties of nitrous oxide. Marie will likely retrieve the information from ____ memory.
A. episodic B. elaborative C. semantic D. procedural