The author of these tools is David A. Schoenfeld, . ( [email protected] ), with support from the Massachusetts General Hospital Mallinckrodt General Clinical Research Center , Research Resources Division, National Institutes of Health, National Center for Advancing Translational Sciences.
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"This Pew Internet & American Life Project report is based on the findings of a nationally representative telephone survey of American teens and a parent or guardian. All numerical data were gathered through telephone interviews conducted by Princeton Survey Research Associates between October 23, and November 19, 2006 among a sample of 935 teens ages 12-17 and a parent or guardian. For results based on the total sample, one can say with 95% confidence that the error attributable to sampling and other random effects is +/- 3%. For results based [on] teen internet users (n=886), the margin of sampling error is +/- 4%."
Through this statement, they seek to minimise the likelihood of some common misunderstandings made when interpreting survey findings. Pew strives for further clarity by adding the following subscript to every reported table in the findings: "Source: Pew Internet & American Life Project Parents and Teens Survey, October-November 2006. Based on online teens who use the internet from home. Margin of error for the overall sample is ±4%." Although it can be difficult to ensure that such information is also reported in a press release and, especially, in press reports of research findings, researchers should strive to ensure that their findings are accurately reported.
(Sonia Livingstone, UK)