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A poll surveyed a random sample of 50 adults. The survey asked the following question: Do you feel things are going well in the United
A poll surveyed a random sample of 50 adults. The survey asked the following question: Do you feel things are going well in the United States these days? (Assume the only answers are Yes or No.) The results are in the table below. Yes No No No No No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No Yes No No Yes Yes Yes Yes Yes No Yes No No Copy Data Step 3 of 3: Notice this small sample yielded a BIG margin of error. A pollster wants to redo the survey and obtain a smaller margin of error. The pollster still want to create a 95% confidence interval, but would like to create an estimate with an error rate of at most 3%. Find the minimum sample size needed to accomplish this. Remember to round sample size up to the next whole number. You don't necessarily need Excel, you can just use your calculator for this one. (Look back at your section 8.4 notes on how to do this.) n= ( z /2 ) 2
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