Math(Probability)

posted by .

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?

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. please/revise english

    Indeed, the environment ignores state borders, and environmental pollution is not restrained within boundaries. When pollution originates in one country and crosses the frontier, leading to negative impact on the environment of other …
  2. math

    A test is composed of six multiple choice questions where each question has 4 choices. If the answer choices for each question are equally likely, find the probability of answering 3 OR 4 questions correctly. 0.131836 0.032959 0.004639 …
  3. Probability

    I need help with this math question. Probability. In a poll, respondents were asked whether they were planning to vote in the local election. 475 respondents indicated that they were planning to vote and 496 said that they were not. …
  4. Math

    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, …
  5. SS

    What do colonialism and imperialism both require?
  6. Social Studies

    What do colonialism and imperialism both require?
  7. Social Studies

    What are the causes of the water pollution that threaten South Asia today?
  8. english

    Which of the following sentence correctly follows the rules of punctuation and capitalization?
  9. probability

    A survey asks people about their reading habits with respect to three newspapers. The results show that 56% read newspaper A, 33% read newspaper B, and 27% read newspapers C. 7% of the respondents read newspapers A and B, 8% of the …
  10. math

    You randomly guess the answers to two questions on a multiple-choice test. Each question has three choices: A, B, and C. a. What is the probability that you guess the correct answers to both questions?

More Similar Questions