Study: Omitting cell phone users may affect polls

WASHINGTON - People with only cell phones may differ enough from those with landline telephones that excluding the growing population of cell-only users from public opinion polls may slightly skew the results, a study has concluded.

The finding, in a report this week by the nonpartisan Pew Research Center, may increase pressure on polling organizations to include people who use only cell phones in their surveys. While many major polls including The Associated Press-GfK Poll already interview cell phone users, some do not, largely because doing so is more expensive.

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