Google wants to know what percentage of users is actively using all three medias – Facebook, Twitter, and an online chat/video tool (Skype, Facetime,…

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Google wants to know what percentage of users is actively using all three medias – Facebook, Twitter, and an online chat/video tool (Skype, Facetime, etc.). What is 99% confidence interval for the true proportion of smartphone users who are actively using all three?

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