# course - Chapter 21 For Problems 1 and 2, consider taking a...

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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 line-up. 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.

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course - Chapter 21 For Problems 1 and 2, consider taking a...

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