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Teens-and-Mobile-Phones (1)

Calls were staggered over times of day and days of

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Unformatted text preview: For example, the findings for teen cell owners are based on a subsample of 625 teens and have a margin of error of ±4 percentage points; the findings for teen texters are based on a subsample of 552 teens and have a margin of error of ±5 percentage points. Sampling errors and statistical tests of significance in this study take into account the effect of weighting (described later in "Weighting and analysis"). Focus Groups The qualitative data comes from focus groups conducted by the University of Michigan and the Pew Research Center ’s Internet & American Life Project. Three of the focus groups were conducted in one city in June 2009 and 6 more groups were held in 3 cities in October 2009 with teens between the ages of 12 and 18. Three of the groups were mixed sex and six of the groups were single sex – 3 groups with each sex. Three of the groups were with middle schoolers and 6 were with high school -aged students. Every effort was made to secure a diverse group of participants, w...
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