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A researcher wishes to​ estimate, with 99 ​% ​confidence, the population proportion of adults who think...

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Basic Math

A researcher wishes to​ estimate, with 99 ​% ​confidence, thepopulation proportion of adults who think Congress is doing a goodor excellent job. Her estimate must be accurate within 2 ​% of thetrue proportion. ​(a) No preliminary estimate is available. Findthe minimum sample size needed. ​(b) Find the minimum sample size​needed, using a prior study that found that 28 ​% of therespondents said they think Congress is doing a good or excellentjob. ​(c) Compare the results from parts​ (a) and​ (b).

Answer & Explanation Solved by verified expert
4.4 Ratings (805 Votes)
Step 1 Using the data given in the question figure out the following variables za2 Divide the confidence interval by two and look that area up in the ztable 99 2 0495 The closest    See Answer
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