A survey organization is going to take a simple random sample of ? voters from among...
A survey organization is going to take a simple random sample of ? voters from among all the voters in a state, to construct a 99% confidence interval for the proportion of voters who favor a proposition. Find an ? such that the total width of the confidence interval (left end to right end) will be no more than 0.06. Remember that you can bound the variance of an indicator.
Homework Answers
The margin of error we desire is ME = 0.06, and for 99%
confidence, we use Z0.005 = 2.58 (well know value using Z table).
Since we have no prior knowledge about the proportion p, we use the
conservative estimate of 
= 0.5. We have:
We need to take n = 462 such that the total width of the confidence interval (left end to right end) will be no more than 0.06.
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