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1) Kim wants to determine a 99 percent confidence interval for the true proportion p of...

1) Kim wants to determine a 99 percent confidence interval for the true proportion p of high school students in the area who attend their home basketball games. Out of n randomly selected students she finds that that exactly half attend their home basketball games. About how large would ? have to be to get a margin of error less than 0.01 for p?
[Use the values for z* from a z-table or t-table, and round to the smallest integer that works.]

n≈?

2) A poll is taken in which 379 out of 600randomly selected voters indicated their preference for a certain candidate.

(a) Find a 99% confidence interval for p.

≤ ? ≤.


(b) Find the margin of error for this 99% confidence interval for p.

Math   Statistics-And-Probability   
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