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example 9.2 in the parent-teen cell phone survey conducted by Princeton survey research associates international, 800 randomly sampled 16-17 year olds living in the U.S. asked wether they have ever used their cell phone text while driving. of the 800 teenagers surveyed, 272 indicated that they text while driving. obtain a 95% confidence interval for the proportion of 16-17 year olds who text while driving.
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