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In a study of cell phone use and brain hemisphericdominance, an Internet survey wase-mailed to 100 subjects randomly selected from an online group involved with

In a study of cell phone use and brain hemisphericdominance, an Internet survey wase-mailed to 100 subjects randomly selected from an online group involved with ears. 742 surveys were returned. Construct a 90% confidence interval for the proportion of returned surveys.

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