Super Bowl Poll

  1. The NFL is a professional American football league of 32 teams. Pick your favorite team — or just any team you think might have a chance to win the Super Bowl (championship game):  .

  2. The margin of error for a sample proportion for a survey of 1000 people would be about %. 
    Here is a graph for how the margin of error changes with sample size and the population proportion p:
    A type of plot
  3. If 17% is the sample percentage, then the margin of error you entered in the above item gives an interval estimate as low as % and as high as %.
  4. If you multiplied the sample size by a factor of nine, that would the margin of error.
  5.  Please answer question 4 to reveal this question.

    The margin of error would then decrease by a factor of .