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12.18 Who uses a cellphone while watching TV? The Pew Research Center's Internet and American Life Project measured the prevalence of multiscreen viewing experiences by asking American adults who are cellphone owners whether they had used their phone to engage in several activities while watching TV. The study reported that 171 of 316 (54%) of urban American cell- phone owners sampled, 516 of 993 (52%) of suburban American cellphone owners sampled, and 251 of 557 (45%) of rural American cellphone owners used their phone to engage in several activities while watching TV. (Data extracted from "The Rise of the Connected Viewer," Pew Research Center's Internet & American Life Project, July 17, 2012.) a. Is there evidence of a significant difference among the urban, suburban, and rural American cellphone owners with respect to the proportion who use their phone to engage in several activi- ties while watching TV? (Use a = 0.05). b. Determine the p-value and interpret its meaning. c. If appropriate, use the Marascuilo procedure and a = 0.05 to determine which groups differ