Posted by **Alex** on Wednesday, May 4, 2011 at 10:00am.

An environmental survey contained a question asking what respondents

thought was the major cause of air pollution in this country, giving the choices “automobiles,” “factories,” and “incinerators.” Two versions of the test, A and B, were used. Let p A and p B be the respective proportions of people using forms A and B who select “factories.” If 170 out of 460 people who used version A chose “factories” and

141 out of 440 people who used version B chose “factories,”

(a) Find a 95% confidence interval for pA – p B .

(b) Do the versions seem to be consistent concerning this answer? Why or why not?

## Answer This Question

## Related Questions

- Math - An environmental survey contained a question asking what respondents ...
- english - Which of the following sentence correctly follows the rules of ...
- SS - What do colonialism and imperialism both require? a) one country giving ...
- Social Studies - What do colonialism and imperialism both require? a) one ...
- math - You randomly guess the answers to two questions on a multiple-choice test...
- Probability - I need help with this math question. Probability. In a poll, ...
- probability - A survey asks people about their reading habits with respect to ...
- Social Studies - What are the causes of the water pollution that threaten South ...
- math - A test is composed of six multiple choice questions where each question ...
- please/revise english - Indeed, the environment ignores state borders, and ...

More Related Questions