For the landline sample half of the time interviewers

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Unformatted text preview: ns' use of the Internet. The results in this report are based on data from telephone interviews conducted by Princeton Survey Research Associates International between December 28, 2009 and January 19, 2010, among a sample of 2,259 adults, age 18 and older in English. For results based on the total sample, one can say with 95% confidence that the error attributable to sampling and other random effects is plus or minus 2.3 percentage points. For results based Internet users (n=1,675), the margin of sampling error is plus or minus 2.7 percentage points. In addition to sampling error, question wording and practical difficulties in conducting telephone surveys may introduce some error or bias into the findings of opinion polls. A combination of landline and cellular random digit dial (RDD) samples was used to represent all adults 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 listed telephone households from active blocks (area code + exchange + two -digit block number) that contained three or more residential directory listings. The cellular sample was not list -assisted, but was drawn through a systematic sampling from dedicated wireless 100 -blocks and shared service 100 -blocks with no directory -listed landline numbers. New sample was released daily and was kept in the field for at least five days. The sample was released in replicates, which are representative subsamples of the larger population. This ensures that complete call procedures were followed for the entire sample. At least 7 attempts were made to complete an interview at sampled telephone number. The calls were staggered over times of day and days of the week to maximize the chances of making contact with a potential respondent. Each number received at Pew Internet & American Life Project Understanding the Participatory News Consumer | 66 least one daytime call...
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