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A 2011 NBC News survey found that 80% of a sample of 4500 American teens said they owned an MP3 player such as an iPod.

A 2011 NBC News survey found that 80% of a sample of 4500 American teens said they owned an MP3 player such as an iPod. Assume that the sample was an SRS.

Based on the sample, the large-sample 90% confidence interval for the proportion of all American teens who own an MP3 player is

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