Mathematics, 06.04.2020 23:07, Anthony1442
During a local election between two candidates, exit polls based on a sample of 400 voters indicated that 54% of the voters supported the incumbent candidate. Construct a 90% confidence interval for the percentage of votes that the incumbent has received in this election.
Answers: 2
, and a confidence level of 
, we have the following confidence interval of proportions.
.
, z is the value of Z that has a pvalue of 
, so 
.
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During a local election between two candidates, exit polls based on a sample of 400 voters indicated...
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