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Pew Internet and American Life Project asked an SRS of 2285 cell phone users whether they...

Pew Internet and American Life Project asked an SRS of 2285 cell phone users whether they had used their cell phone to look up health or medical information. Of these, 462 said “Yes.” Calculate a 99% confidence interval to estimate the proportion of all cell phone users who have used their cell phone to look up health or medical information. What is the upper bound of your confidence interval?

(Give at least two decimal places.)

Math   Statistics-And-Probability   
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