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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.

How many American teens must be interviewed to estimate the proportion who own an MP3 player within 0.02 with 99% confidence using the large-sample confidence interval? Use 0.5 as the conservative guess forp.

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