Module 16 – Introduction to Confidence Intervals (2 of 8 groupwork 1)

Progress Check

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

  • Use a given margin of error to find and interpret the 95% confidence interval.

Learn by Doing

Use the rubric at the bottom of this page as a guide for completing this assignment.


Submit your work:

  • Carefully read all sections below (beginning with the Context section and ending with the Prompt section).
  • Commit a good-faith effort to address all items in the Prompt section below. Please be sure to number your responses.

Complete your assigned peer reviews:

  • After you submit your initial good-faith attempt, continue to the ANSWER(S) page and review your instructor’s response. But please do not submit your corrected work yet.
  • Within three days after the due date, return to this assignment and complete your assigned peer reviews (directions (Links to an external site.)).

Submit your corrected work:

  • We all learn from mistakes (our own and our classmates’ mistakes). So please do not immediately correct your own mistakes. If possible, wait until you receive feedback from at least one of your peers.
  • If necessary, correct your work and resubmit the entire assignment. Your instructor will only review and grade your most recent submission, so please do not refer to a previous submission.


A Gallup poll conducted in November of 2011 asked the following question, “What would you say is the most urgent health problem facing this country at the present time?” The choices were access, cost, obesity, cancer, government interference, or the flu. The responses were access (27%), cost (20%), obesity (14%), cancer (13%), government interference (3%), or the flu (less than 0.5%).

The following is an excerpt from the Survey Methods section. “Results for this Gallup poll are based on telephone interviews conducted Nov. 3-6, 2011, with a random sample of 1,012 adults ages 18 and older, living in all 50 U.S. states and the District of Columbia. For results based on a total sample of national adults, one can say with 95% confidence that the maximum margin of sampling error is ±4 percentage points.”


If we accept the maximum margin of sampling error provided above, find a 95% confidence interval to estimate the percentage of U.S. adults who feel that access to healthcare is the most urgent health problem facing this country. Interpret your interval in context.

Content by the Open Learning Initiative (Links to an external site.) and licensed under CC BY (Links to an external site.).


Peer Reviewed Assignment

Peer Reviewed Assignment

Criteria Ratings Pts

This criterion is linked to a Learning OutcomeAddressing the Prompt

8 pts

Full Marks

All parts of the Prompt are addressed. Answers are correct. Statistical vocabulary is used appropriately. Writing is clear and thought process is easy to follow.

5 pts

Partial Credit

Some parts of the prompt are not addressed, are incorrect, or are unclear.

0 pts

No Marks

The prompt is not addressed.

8 pts

This criterion is linked to a Learning OutcomeIndividual Penalty

0 pts

No individual penalty

-1 pts

Individual penalty.

Please see the instructor comments for more information.

0 pts

This criterion is linked to a Learning OutcomePeer Reviews

2 pts

Full Marks

You completed all assigned peer reviews (maximum of 2). For each peer review, the points you assigned in the rubric are appropriate. You included comments explaining the score you posted in the rubric. If you deducted points in the rubric, your comments explain what the author needs to do to earn a higher grade when the teacher grades the assignment.

1 pts

Partial Credit

Committed a good-faith effort to provide a high-quality peer review, but many necessary instructive comments are missing.

0 pts

No Marks

No peer review provided or the comments are not instructive.

2 pts

Total Points: 10

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