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Biology 39 Online
OpenStudy (anonymous):

A study was conducted to test the effectiveness of Seeing Eye Dogs. People with different ranges of vision loss were included in the study. Which question would help in determining whether the conclusion above is valid? A.What was the average age of the people in the study? B.What was the most common occupation of people in the study? C.How many people in the study had a pet? D.How many people in the study had hearing problems?

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