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Chapter 8: Q.3 (page 477)
Which distribution should you use for this problem?
The distribution is.
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On May , Gallup reported that of the people surveyed, of U.S. workers believe that they will continue working past retirement age. The confidence level for this study was reported at with a margin of error.
a. Determine the estimated proportion from the sample.
b. Determine the sample size.
c. Identify CL and .
d. Calculate the error bound based on the information provided.
e. Compare the error bound in part d to the margin of error reported by Gallup. Explain any differences between the values.
f. Create a confidence interval for the results of this study.
g. A reporter is covering the release of this study for a local news station. How should she explain the confidence interval to her audience?
In words, define the random variable .
In one complete sentence, explain what the interval means.
Which distribution should you use for this problem?
When designing a study to determine this population proportion, what is the minimum number you would need to survey to be confident that the population proportion is estimated to within ?
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