ch Contents media Library ase Options for Success ussions are Tools SCO 9.1.41 2 of 14 (5 complete) HW Score: 23.81%, 3.33 of 14 pts Question Help Just before a referendum on a school budget, a local newspaper polls 369 voters to predict whether the budget will pass. Suppose the budget has the support of 55% of the voters. What is the probability that the newspaper's sample will lead it to predict defeat? The probability is (Round to three decimal places as needed.) structor Resources Enter your answer the answer box and then click Check Answer All parts showing OK Clear All Check Ar orrect 9.1.35 Question Help Based on past experience, a bank believes that 12% of the people who receive loans will not make payments on time. The bank has recently approved 200 loans. Answer the following questions. a) What are the mean and standard deviation of the proportion of clients in this group who may not make timely payments? sources -19 Enter your answer in the answer box and then click Check Answer 3 P remaining OK Clear All Check Antwer orrec wrary Mons 9.1.43 Question Help When a truckload of apples arrives at a packing plant, a random sample of 175 is selected and examined for bruises, discoloration, and other defects. The whole truckload will be rejected if more than 8% of the sample is unsatisfactory. Suppose that in fact 10% of the apples on the truck do not meet the desired standard. What is the probability that the shipment will be accepted anyway? Placcepted) (Round to three decimal places as needed.) Resources Enter your answer in the answer box and then click Check Answer All parts showing OK Char At Check Answ orrect Score: 0 of 1 pt 9.1.51 6 of 14 (5 complete) HW Score: 23.81%, 3.33 of 14 pts Question Help * A small company involved in e-commerce is interested in statistics concerning the use of e-mail. A poll found that 39% of a random sample of 1104 adults, who use a computer at their home, work, or school, said they do not send or receive e-mail. Complete parts a through e a) Find the margin of error for this poll if we want 95% confidence in our estimate of the percent of American adults who do not use e-mail. E-(Round to three decimal places as needed.) sources Enter your answer in the answer box and then click Check Answer 4 parts remaining OK Clear All Chuck Ar SAMSUNG prrect: Catist Homework: HWK #8 (Chapter 9) Score: 0 of 1 pt 7 of 14 (5 completo) ▼ 9.1.53 e Save HW Score: 23.81%, 3.33 of 14 pts Question Help Es An insurance company checks police records on 578 accidents selected at random and notes that teenagers were at the wheel in 87 of them. Complete parts a) through d) י a) Construct the 95% confidence interval for the percentage of all auto accidents that involve teenage drivers 95% CI=%%) ok (Round to one decimal place as needed.) mch ar Contents media Library Chase Options wls for Success scussions Enter your answer in the edit fields and then click Check Answer Course Tosis instructor Resources 3 parts remaining OK Cle Check Ar orrect: 1 Homework: HWK #8 (Chapter 9) Score: 0 of 1 pt 9.1.57 8 of 14 (5 complete)▼ Save HW Score: 23.81%, 3.33 of 14 pts Question Help In a survey on downloading music, a poll asked 746 Internet users if they "ever downloaded music from an Internet site that was not authorized by a record company. or not, and 21% responded "yes." Construct a 99% confidence interval for the true proportion of Internet users who have downloaded music from an Internet site that was not authorized What is the confidence interval? Select the comect choice below and, if necessary, fill in the answer boxes within your choice. A. The 99% confidence interval is (%) (Round to one decimal place as needed) OB. The conditions for constructing a confidence interval are not satisfied * Sources Click to select and enter your answer(s) and then click Check Answer All parts showing OK Clear Al Par Check SAMSUNG orrect: 1 Homework: HWR #8 (Chapter 9) Score: 0 of 1 pt 9.1.60 ary ins 9 of 14 (5 complete)▼ HW Score: 23.81%, 3.33 of 1- Question Help People were surveyed worldwide, being asked the question "How important is acquiring wealth to you?" Of 1526 respondents in country A, 1187 said that it was of more than average importance. In country B, of 1323 respondents, 599 said it was of more than average importance. a) What proportion thought acquiring wealth was of more than average importance in each country's sample? b) Create a 99% confidence interval for the percentage of people who thought it was of more than average importance in country A. (Be sure to test conditions.) Compare that to a confidence interval for the country B population a) The sample proportions are for country A and for country B. (Round to three decimal places as needed.) 035 Enter your answer in the edit fwilds and then click Check Answer 2 parts remaining Resources OK Clear All Check Arnover D Question Help A poll asked a group of people if the fact that they can make copies of songs on the Internet for free made them more likely-or less likely to buy a performer's CD Only 11% responded that it made them "less likely." The poll was based on a random sample of 683 Internet users a) Check that the assumptions and conditions are met for inference on proportions b) Find the 90% confidence interval for the true proportion of all Internet users who are "less likely to buy CDs. a) Check the assumptions and conditions. Choose the correct answer below OA This was a random sample of more than 10% of all Internet users; the sample is too large. OB. The independence assumption is violated, whether one person is "less likely to buy a performer's CD is dependent on whether another person is "less likely to buy a performer's CD OC This was a random sample of less than 10% of all Internet users; there are less than 10 successes, so the sample is not large enough This was a random sample of less than 10% of all Internet users; there were at least 10 successes and 10 failures, so the sample is large enough b) Select the conect choice below and fill in any answer boxes within your choice. OA The 90% confidence interval is (C) (Round to three decimal places as needed) Click to select and enter your answer(s) and then click Check Answer All parts showing Clear All Check Answer * orrect: 1. ces A poll asked a group of people if the fact that they can make copies of songs on the Internet for free made them more Only 11% responded that it made them "less likely." The poll was based on a random sample of 683 Internet users. a) Check that the assumptions and conditions are met for inference on proportions. b) Find the 90% confidence interval for the true proportion of all Internet users who are "less likely" to buy CDs. OA. This was a random sample of more than 10% of all Internet users; the sample is too large. OB. The independence assumption is violated, whether one person is "less likely to buy a performer's CD is dependera to buy a performer's CD OC. This was a random sample of less than 10% of all Internet users; there are less than 10 successes, so the sample D. This was a random sample of less than 10% of all Internet users; there were at least 10 successes and 10 failures. b) Select the correct choice below and fill in any answer boxes within your choice. OA. The 90% confidence interval is ( (Round to three decimal places as needed.) B. The conditions of a confidence interval are not satisfied. Click to select and enter your answer(s) and then click Check Answer All parts showing OK Clear All Question Help A company manufacturing CDs is working on a new technology. A random sample of 711 Internet users were asked. "As you may know, some CDs are being manufactured so that you can only make one copy of the CD after you purchase it. Would you buy a CD with this technology, or would you refuse to buy it even if it was one you would normally buy? Of these users, 69% responded that they would buy the CD. a) Create a 95% confidence interval for this percentage. b) If the company wants to cut the margin of enor in half, how many users must they survey? a) The 95% confidence interval is (%) (Round to one decimal place as needed.) Ces Enter your answer in the edit fields and then click Check Answer 1 Part remaining OK Clear Al Click Fram arre ry ources Question Help An environmental agency worries that many cars may be violating clean air emissions standards. The agency hopes to check a sample of vehicles in order to estimate that percentage with a margin of error of 3% and 99% confidence. To gauge the size of the problem, the agency first picks 60 cars and finds 6 with faulty emissions systems. How many should be sampled for a full investigation? The environmental agency should sample at least vehicles. (Round up to the nearest whole number) Enter your answer in the answer box and then click Check Answer All parts showing OK Clear All Check Acnew orrect: 1 19-1 It's believed that as many as 24% of adults over 50 never graduated from high school. We wish to see if this percentage is the same among the 25 to 30 age group Question Help a) How many of this younger age group must we survey in order to estimate the proportion of non-grads to within 8% with 90% confidence? n (Round up to the nearest integer) ources Enter your answer in the answer box and then click Check Answer 2 parts remaining OK Clear All Check Aswer SAMSUNG orrect: 1