1. Since Students Guide to Critical Thinking

ANS-8 Answers to Selected Exercises

III. 1. Answers will vary. Pertinent counterpoints

include: Not all colleges cost a fortune. Often students who were bored in high school f ind that they enjoy college work. Though jobs like truck- ing and construction may be relatively high- paying, the work may be more dangerous, less enjoyable, less prestigious, and less secure than many jobs that require a college education. The difference in earning power may also be greater than this individual supposes. Studies consistently show that college graduates make on average about 45 percent more than those who have only a high school diploma. 4. Answers will vary. Some pertinent counterpoints include: Although the meaning of the Second Amendment is hotly debated, few would argue that the “right to bear arms” extends to military-style weapons that are neither necessary for personal protection nor suitable for hunting. Moreover, the risks of legalizing such weapons would seem to outweigh the gains. The risks of foreign inva- sion or a breakdown of society are probably pretty remote. By contrast, the risk that such weapons could fall into the hands of criminals or be used in Columbine-type massacres, domestic disputes, and accidental shootings is high. 7. Answers will vary. Pertinent points that arguably weaken or refute the argument include: There is a likelihood that legalizing hard drugs would lead to greatly increased use and addiction rates, with all the personal and societal costs this would en- tail: more overdoses, hospitalizations, car accidents, industrial accidents, suicides, family break-ups, unemployable workers, lower productivity, and so forth. Legalizing hard drugs would also likely make these drugs more readily available to children and implicitly send a message that these drugs aren’t harmful. C HAPTER 9 E XERCISE 9.1 1. Artichokes Fruits 4. Skateboarders Jazz fans X 9. [Thus, it is ridiculous to say that drugs should be legalized because drug use is escalating from 7 and 8.] 10. Common sense and state experiments with the decriminalization of marijuana in the 1970s tell us that when there are fewer controls, there will be more incidents. 11. America’s two favorite legal drugs—alcohol and nicotine—have a tremendous negative impact on the physiological, social, psychological, economic, and spiritual aspects of our lives. 12. Thus, if drugs were legalized, hospitalizations, crimes, car accidents, addicted babies, industrial accidents, family break-ups, and other problems affiicting our society would worsen significantly. from 10 and 11 13. [Therefore, drugs should not be legalized from 2, 6, 9, and 12.] C HAPTER 8 E XERCISE 8.3

I. 1. The statement is self-refuting. If no statements are

true, then the statement that no statements are true isn’t true either. So, if the statement is true, it’s false, which is a contradiction. 4. The statement is self-refuting. If no beliefs are jus- tified, then the belief that no beliefs are justified isn’t justified either. So, if the statement is true, it’s false, which is contradictory. Looked at another way, if we should be absolute and total skeptics i.e., hold that no beliefs are justified, we should be skeptical of the claim that we should be absolute and total skeptics, and hence not be absolute and total skeptics. The statement asserts that we should be absolute and total skeptics, yet implies that we shouldn’t, which is contradictory. 7. If the claim here is that all children in Lake Wobegon are above average with respect to other Lake Wobegon children, the claim is necessarily false, for something can be above average in a compari- son group only if some other things in the group are below average. The statement is not necessarily false if it means that all children in Lake Wobegon are above the national average.

II. 1. What about polar bears, seals, walruses, and orcas,

to name a few? 4. Plausible counterexamples include Thoreau, Melville, Hawthorne, Poe, Fitzgerald, Hemingway, and Faulkner, among others. 7. Don’t forget good ol’ Ohio and Utah.