Confidence interval

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Progress Check

Use this activity to assess whether you and your peers can: 

Calculate a 90% and a 95% confidence interval.

Relate the interval width of a confidence interval to its margin of error (MOE).

  • Compare interval widths of two confidence intervals and draw conclusions.
  • Directions
  • Use the drop-down menu to learn about the three steps needed to complete this assignment.

Prompt

Harris Interactive® conducted a poll of American adults in August of 2011 to study the use of online medical information. Of the 1,019 randomly chosen adults, 60% had used the Internet within the past month to obtain medical information. 

Use the results of this survey to create an approximate 95% confidence interval estimate for the percentage of all American adults who have used the Internet to obtain medical information in the past month.

Calculate the 90% confidence interval.

Which confidence interval has the smaller margin of error? Why does this make sense? 

Which confidence interval is more likely to contain the true percentage of all American adults who have used the Internet to obtain medical information in the past month? Briefly explain your reasoning.

Confidence interval

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