Question: Pew Research Center publishes polls on issues important in the news and about American life at its website, www.pewinternet.org. At the end of a report

Pew Research Center publishes polls on issues important in the news and about American life at its website, www.pewinternet.org. At the end of a report about a survey you can find a paragraph such as this one: These readings come from a national survey conducted between November 14 and December 9, 2012 of U.S. adults on landline and cell phones and in English and in Spanish. The results reported here come from the 1,802 respondents who are internet users and the margin of error is +/- 2.6 percentage points.
a) For this survey, identify the population of interest.
b) Pew performs its surveys by phoning numbers generated at random by a computer program. What is the sampling frame? Does this seem representative of the population?

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