Teens-and-Mobile-Phones (1)

Data was kept only if the child interview was

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Unformatted text preview: of Michigan, usually in teams of two, with one lead moderator and one secondary moderator. University of Michigan graduate students also attended the focus groups. Further details on the design, execution and analysis of the quantitative telephone survey are discussed below. For those interested in calculating the margin of error for various subgroups mentioned in this report, please see the section titled "Effects of Sample Design on Statistical Inference" for the formula for that calculation. Quantitative Survey Design and Data Collection Procedures Sample Design A combination of landline and cellular random digit dial (RDD) samples was used to represent all teens and their parents in the continental United States who have access to either a landline or cellular telephone. Both samples were provided by Survey Sampling International, LLC (SSI) according to PSRAI specifications. Numbers for the landline sample were selected with probabilities in proportion to their share of liste...
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