Solution Found!
An environmental survey contained a question asking what respondents thought was the
Chapter 7, Problem 7.3-12(choose chapter or problem)
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 pA and pB 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 pB. (b) Do the versions seem to be consistent concerning this answer? Why or why not?
Questions & Answers
QUESTION:
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 pA and pB 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 pB. (b) Do the versions seem to be consistent concerning this answer? Why or why not?
ANSWER:Step 1 of 6
The number of respondents who used form A and chose “factories” is 
