Mathematics

Confidence Intervals

  • Being able to understand and critically think about statistics presented to you is an important skill in your career. Find a published poll or survey (pollingreport.com is a great place to look) which includes a margin of error as part of the report. Discuss what the margin of error means as applied to your selected poll or survey and how that information provides additional information beyond the point estimates reported.
  • Select one of the percentages from the poll and construct the confidence interval for that percentage. Note that because the margin of error is given to you, you do NOT need to calculate it in order to construct the interval. Explain what the confidence interval for that percentage (proportion) means. Be sure to include the link to your selected survey or poll.
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