Surveys have become an important component of American life. They directly affect us in so many

Surveys have become an important component of American life. They directly affect us in so many ways, including public policy, the television shows we watch, the products we buy, and the political leaders we elect. Because surveys are now such and internal part of our lives. It is important that every citizen has the ability to interpret survey results. Surveys are the focus of this project.


A recent Harris survey of 1961 adults showed that 76% have registered for the “DO NOT CALL” registry, so that telemarketers do not phone them.


Analyzing the data


  1. Use the survey result to construct a 95% confidence interval estimate of the percentage of all adults on the “Do Not Call” registry

  2. Identify the margin of error for this survey

  3. Explain why it would or would not be Okay for a newspaper : “ based on results from a recent survey, the majority of adults are not on the “Do Not Call” registry

  4. Assume that you are a newspaper reporter. Write a description of the survey results for your newspaper.

  5. A common criticism of surveys is that they poll only a very small percentage of the population and therefore cannot be accurate. Is a sample of only 1961 adults taken from a population of 225,139,000 adults a sample size that is too small? Write an explanation of why the sample size of 1961 is or is not too small.

  6. CTE 9: In this project, you will compute confidence intervals. In particular, you will compute confidence intervals for the same quantity measured at different times, and you will then compare these intervals. The subject is temperature and the patterns exhibited over several years.



  1. Click on the following document for the description and the requirements to complete this CTE: Weather Patterns



  1. CTE 10: From Data to Decision on page 386 of your textbook
    What do the “Do Not Call” registry survey results tell us?



  1. Analyzing the Data:
    Completely answer questions 1 – 5.