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In a study of cell phone use and brain hemispheric dominance, an Internet survey was e-mailed to 2541 subjects randomly selected from an online group

In a study of cell phone use and brain hemispheric dominance, an Internet survey was e-mailed to

2541

subjects randomly selected from an online group involved with ears.

1171

surveys were returned. Construct a

90%

confidence interval for the proportion of returned surveys.

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