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Reviewing historical data, medical researchers in California [#permalink]
19 Mar 2007, 12:52
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Reviewing historical data, medical researchers in California found that counties with the largest number of television sets per capita have had the lowest incidence of a serious brain disease, mosquito-borne encephalitis. The researchers have concluded that people in these counties stay indoors more and thus avoid exposure to the disease.
The researchersâ€™ conclusion would be most strengthened if which of the following were true?
(A) Programs designed to control the size of disease-bearing mosquito populations have not affected the incidence of mosquito borne encephalitis.
(B) The occupations of county residents affect their risk of exposure to mosquito-borne encephalitis more than does television-watching.
(C) The incidence of mosquito-borne encephalitis in counties with the largest number of television sets per capita is likely to decrease even further.
(D) The more time people in a county spend outdoors, the greater their awareness of the dangers of mosquito-borne encephalitis.
(E) The more television sets there are per capita in a county, the more time the average county resident spends watching television.
E for me. We need to strengthen the following conclusion: people in counties with the largest number of television sets per capita stay indoors more and thus avoid exposure to the disease. E perfectly strenthens is by providing a supporting premise, which is that people who own TVs actually watch them, thereby staying indoors.