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7 Do You Drink Pop A July 2015 Gallup poll asked a national sample of...

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7 Do You Drink Pop A July 2015 Gallup poll asked a national sample of 1009 adults aged 18 and over if they actively avoided drinking soda or pop Of those sampled 61 indicated they do so Gallup announced the poll s margin of error for 95 confidence as 4 percentage points Which of the following sources of error are included in this margin of error a Gallup dialed landline telephone numbers at random and so missed all people without landline phones including people whose only phone is a cell phone b Some people whose numbers were chosen never answered the phone in several calls or answered but refused to participate in the poll c There is chance variation in the random selection of telephone numbers

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