4. Reviewing historical data, medical researchers in California found that count

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试卷: TS Critical Thinking 20 题 No2


[单选题]

4. 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 researchers’ conclusion would be most strengthened if which of the following were true?

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