SOLUTION: In a recent presidential election, 611 voters were surveyed and 308 of them said that they voted for the candidate who won (based on data from the ICR Survey Research Group). Find

Algebra ->  Probability-and-statistics -> SOLUTION: In a recent presidential election, 611 voters were surveyed and 308 of them said that they voted for the candidate who won (based on data from the ICR Survey Research Group). Find       Log On


   

Question 1114842: In a recent presidential election, 611 voters were surveyed and 308 of them said that they voted for the candidate who won (based on data from the ICR Survey Research Group). Find a 99% confidence interval estimate of the percentage of voters who said that they voted for the candidate who won.
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
In a recent presidential election, 611 voters were surveyed and 308 of them said that they voted for the candidate who won (based on data from the ICR Survey Research Group). Find a 99% confidence interval estimate of the percentage of voters who said that they voted for the candidate who won.
----
sample proportion:: 308/611 = 0.5041
ME = z*sqrt(pq/n) = 2.5758*sqrt[(308/611)*(303/611)/611] = 0.0521
----
99% CI: 0.5041-0.0521 < p < 0.5041+0.0521
--------------
Cheers,
Stan H.
-------