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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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- Fall '13