1690 AC FAB-0.7809FBC 0 FCD+0.8575F, = 0 DE 0.9231F 0.3846F AC 0.6247FBC-FBD = 0 FBD-0.5145F Fr -FAB DE 0.3846FCE-0.3846F AC-0.7809FBC-FCD = 0 0.9231FAC+0.6247FBC-0.9231FCE = 0 = 3625 DF 0
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solve using gauss seidel
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- Explain the differences between Gaussian elimination and Gauss-Jordan elimination.Suppose that there are 4 deaths due to stomach can- cer among workers in a tire plant from 1/1/64 to 12/31/83, while 2.5 are expected based on U.S. mortality rates. Provide a 95% CI for the expected number of deaths from stomach cancer over 20 years among the tire workers. Is the number of cases of stomach cancer excessive?Suppose that a magazinemagazine predicted that Candidate A would defeat Candidate B in a certain election. They conducted a poll of its subscribersits subscribers with a response rate of 2424%. On the basis of the results, the magazinemagazine predicted that Candidate A would win with 57% of the popular vote. However, Candidate B won the election with about 62% of the popular vote. At the time of this poll, most subscribers to the magazinesubscribers to the magazine belonged to the party of Candidate A. Name two biases that led to this incorrect prediction.Choose the correct answer below. A.Nonresponse bias: The low response rate caused bias.Response bias: The way the poll was administered showed bias. B.Sampling bias: Using an incorrect frame led to undercoverage.Nonresponse bias: The low response rate caused bias. C.Sampling bias: Using an incorrect frame led to undercoverage.Response bias: The way the poll was administered showed bias. Click to select your answer.
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- A study was conducted by researchers to determine if application of duct tape is more effective than cryotherapy (liquid nitrogen applied to the wart for 10 seconds every 2 to 3 weeks) in the treatment of common warts.The researchers randomly divided 40 patients into two groups. The 20 patients Group 1 had their warts treated by applying duct tape to the wart for 6.5 days and then removing the tape for 12 hours, at which point the cycle was repeated, for a maximum of 2 months. The 20 patients in group 2 had their warts treated by cryotherapy for a maximum of six treatments.Once the treatments were complete, it was determined that 17 patients in Group 1 (duct tape) and 11 patients in Group 2 (cryotherapy) had complete resolution of their warts. Conduct a hypothesis test to address the research question whether application of duct tape is more effective than cryotherapy in the treatment of common warts. Set a = 0.05A study was conducted by researchers to determine if application of duct tape is more effective than cryotherapy (liquid nitrogen applied to the wart for 10 seconds every 2 to 3 weeks) in the treatment of common warts. The researchers randomly divided 40 patients into two groups. The 20 patients Group 1 had their warts treated by applying duct tape to the wart for 6.5 days and then removing the tape for 12 hours, at which point the cycle was repeated, for a maximum of 2 months. The 20 patients in group 2 had their warts treated by cryotherapy for a maximum of six treatments. Once the treatments were complete, it was determined that 17 patients in Group 1 (duct tape) and 11 patients in Group 2 (cryotherapy) had complete resolution of their warts. (Source: Archives of Pediatrics and Adolescent Medicine, 156(10), 2002). Conduct a hypothesis test to address the research question whether application of duct tape is more effective than cryotherapy in the treatment of common warts. Set…Even though you have no symptoms, your doctor withes to test you for a raredisease that only 1 in 10,000 people of your age contract. The test is 98%accurate, which means that, if you have the disease, 98% of the times the testwill come out positive and 2% negative. Also, if you do not have the disease, the test will come out negative 96% of the time and positive 4% of the time. You take the test and it comes out positive. What is the probability that you have the disease?
- The ratios of calves to yearlings to adults in a wildebeest herd should be 5:3:2 if the herd is to be stable- neither shrink nor grow in subsequent generations. You go out and take a random sample of individuals from this herd and count 52 calves, 28 yearlings and 15 adults. Do you predict that this herd will remain stable? Do the proportions of these 3 age groups in your match those that would be expected in a stable herd?The proportion of people in a given community who have Covid-19 infection is 0.005. A test is available to diagnose the disease. If a person has Covid-19, the probability that the test will produce a positive signal is 0.009 . If a person does not have the Covid-19, the probability that the test will produce a positive signal is 0.01. What is the probability that the test will generate positive signal? Which model/rule will best be good for solving the above problem and why? Comment on the types of events you see in the problem and name them.An investigator wants to test whether exposure to secondhand smoke before 1 year of life is associated with development of childhood asthma (defined as asthma diagnosed before 5 years of age). Give two possible study designs and indicate the pros and cons of each. Then, provide your recommendation for the most efficient design.
