A researcher wishes to​ estimate, with 95​% ​confidence, the population proportion of adults who think Congress is doing a good or excellent job. Her estimate must be accurate within 4​% of the true...


A researcher wishes to​ estimate, with
95​%

​confidence, the population proportion of adults who think Congress is doing a good or excellent job. Her estimate must be accurate within
4​%

of the true proportion.

​(a) No preliminary estimate is available. Find the minimum sample size needed.

​(b) Find the minimum sample size​ needed, using a prior study that found that
34​%

of the respondents said they think Congress is doing a good or excellent job.

​(c) Compare the results from parts​ (a) and​ (b).


Jun 01, 2022
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