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The project entailed a survey of 1,503 U.S. adults, with 752 interviewed in a conventional landline sample and 751 interviewed on their cell phones, using a sample drawn from a nationally representative cell telephone number database. The interviews were conducted March 8-28, 2006 and averaged about 11 minutes in length. Among those interviewed on their cell phones, 200 (27%) said that their cell phone was their only phone. The alternate hypothesis stated the population users that owned a cell phone and land line was greater than 27%. The null hypothesis stated that the population users that owned just a cell phone were less than 27%...
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