Question The higher the level of certain vitamins and minerals in the bloodstream, the better a person’s lung function, as measured by the amount of air the person can expel in one second. The lung function of smokers is significantly worse, on average, than that of nonsmokers. Clearly, therefore, one way for smokers to improve …
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Question Since the deregulation of airlines, delays at the nation’s increasingly busy airports have increased by 25 percent. To combat this problem, more of the takeoff and landing slots at the busiest airports must be allocated to commercial airlines. Which of the following, if true, casts the most doubt on the effectiveness of the solution …
Question Which of the following most logically completes the argument? When officials in Tannersburg released their plan to widen the city’s main roads, environmentalists protested that widened roads would attract more traffic and lead to increased air pollution. In response, city officials pointed out that today’s pollution-control devices are at their most effective in vehicles …
Question Firms adopting “profit-related-pay” (PRP) contracts pay wages at levels that vary with the firm’s profits. In the metalworking industry last year, firms with PRP contracts in place showed productivity per worker on average 13 percent higher than that of their competitors who used more traditional contracts. If, on the basis of the evidence above, …
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Question Caterpillars of all species produce an identical hormone called “juvenile hormone” that maintains feeding behavior. Only when a caterpillar has grown to the right size for pupation to take place does a special enzyme halt the production of juvenile hormone. This enzyme can be synthesized and will, on being ingested by immature caterpillars, kill …
Question Which of the following most logically completes the argument below? When mercury-vapor streetlights are used in areas inhabited by insect-eating bats, the bats feed almost exclusively around the lights, because the lights attract flying insects. In Greenville, the mercury-vapor streetlights are about to be replaced with energy-saving sodium streetlights, which do not attract insects. …
Question In each of the past five years, Barraland’s prison population has increased. Yet, according to official government statistics, for none of those years has there been either an increase in the number of criminal cases brought to trial, or an increase in the rate at which convictions have been obtained. Clearly, therefore, the percentage …
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Question Prolonged spells of hot, dry weather at the end of the grape-growing season typically reduce a vineyard’s yield, because the grapes stay relatively small. In years with such weather, wine producers can make only a relatively small quantity of wine from a given area of vineyards. Nonetheless, in regions where wine producers generally grow …
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Question Economist: On average, the emergency treatment for an elderly person for injuries resulting from a fall costs $11,000. A new therapeutic program can significantly reduce an elderly person’s chances of falling. Though obviously desirable for many reasons, this treatment program will cost $12,500 and thus cannot be justified. Which of the following, if true, …
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Question Motorists in a certain country frequently complain that traffic congestion is much worse now than it was 20 years ago. No real measure of how much traffic congestion there was 20 years ago exists, but the motorists’ complaints are almost certainly unwarranted. The country’s highway capacity has tripled in the last twenty years, thanks …
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