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In a certain town, there are 4,000 registered voters, of whom 1,600 are Democrats. A survey...

In a certain town, there are 4,000 registered voters, of whom 1,600 are Democrats. A survey organization is about to take a random sample of 100 registered voters.

(a) There is about a 50-50 chance that the percentage of Democrats in the sample will be bigger than _____.

(b) Find the expected value for the sample percentage,

(c) Find the standard error for the sample percentage.

(d) Find the chance that 30% or more of the people in sample are Democrats.

(e) True or false: If a large sample were taken, the standard error for the sample percentage would have been smaller

Math   Statistics-And-Probability   
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