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The ways that we communicate have been dramatically affected by the use of answering machines, fax...

The ways that we communicate have been dramatically affected by the use of answering machines, fax machines, voice mail, and e-mail. Suppose a sociologist wants to determine the current percentage of U.S. households currently using e-mail. a) Given the fact that in 1997, 16.9% of U.S. households used e-mail, how many households must be surveyed in order to be 95% confident that the current sample percentage is in error by no more than four percentage points? b) Answer the same question if we have no prior 1997 information.

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