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Chapter 21
For Problems 1 and 2, consider taking a sample of the given size from a box containing
50,000 tickets, all 0’s and 1’s.
1. A sample of 400 tickets has 72% 1’s.
a) What percentage of the entire box do you expect to be 1’s?
What is the standard
error on your estimate?
b) Can you give a meaningful 95% confidence interval for the percentage of 1’s in the
box?
If so, then estimate it.
If not, explain why not.
2. A sample of 100 tickets has 3% 1’s.
a) What percentage of the entire box do you expect to be 1’s?
What is the standard
error on your estimate?
b) Can you give a meaningful 95% confidence interval for the percentage of 1’s in the
box?
If so, then estimate it.
If not, explain why not.
3.
(Hypothetical) A TV corporation contracts a polling organization to perform a study to
find out whether or not people are watching the company’s Friday night lineup.
a) In one city, the polling organization takes a simple random sample of 1,000 people
(age 18 or older) and asks people if they watch any of the Friday night shows.
Of the
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This note was uploaded on 04/17/2008 for the course MATH 1680 taught by Professor Patton during the Spring '08 term at North Texas.
 Spring '08
 Patton
 Statistics

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