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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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- Fall '13