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- Some people seem to believe that you can fix anything with duct tape. Even so, many were skeptical when researchers announced that duct tape may be a more effective and less painful alternative than liquid nitrogen, which doctors routinely use to freeze warts. An article described a study conducted at a medical center. Patients with warts were randomly assigned to either the duct tape treatment or the more traditional freezing treatment. Those in the duct tape group wore duct tape over the wart for 6 days, then removed the tape, soaked the area in water, and used an emery board to scrape the area. This process was repeated for a maximum of 2 months or until the wart was gone. Data consistent with values in the article are summarized in the following table. Treatment n Number with WartSuccessfully Removed Liquid nitrogen freezing 103 60 Duct Tape 101 88 Do these data suggest that freezing is less successful than duct tape in removing warts? Test the relevant hypotheses using…Some people seem to believe that you can fix anything with duct tape. Even so, many were skeptical when researchers announced that duct tape may be a more effective and less painful alternative than liquid nitrogen, which doctors routinely use to freeze warts. An article described a study conducted at a medical center. Patients with warts were randomly assigned to either the duct tape treatment or the more traditional freezing treatment.Those in the duct tape group wore duct tape over the wart for 6 days, then removed the tape, soaked the area in water, and used an emery board to scrape the area. This process was repeated for a maximum of 2 months or until the wart was gone. Data consistent with values in the article are summarized in the following table. Treatment n Number with WartSuccessfully Removed Liquid nitrogen freezing 100 60 Duct Tape 103 88 Do these data suggest that freezing is less successful than duct tape in removing warts? Test the relevant hypotheses using…Globally, 35% of all ridged brittleshell tortoises have spots on their shells. A herpetologist in Citition collects a sample of 38 ridged brittlesell tortoises and finds that 16 of them have spots on their shells. The herpetologist would like to test the claim that the proportion of ridged brittleshell tortoises in Cititon with spots on their shells is greater than 35%. The herpetologist ends up rejecting the null hypothesis. If the actual proportion of ridged brittleshell tortoises in Cititon with spots on their shells is 41%, then what type of error, if any, has occurred? In the problem above, what is the test statistic?
- The television show CSI: Shoboygan has been successful for many years. That show recently had a share of 19, which means, that among the TV sets in use, 19% were tuned to CSI: Shoboygan. An advertiser wants to verify that 19% share value by conducting its own survey, and a pilot survey begins with 12 households have TV sets in use at the time of a CSI: Shoboygan broadcast.A new restaurant with 134 seats is being planned. Studies show that 57% of the customers demand a smoke-free area. How many seats should be in the non-smoking area in order to be very sure (μ+3σ) of having enough seating there?A case-control study is being planned to see whether proximity to a nuclear power plant is associated with the development of certain cancers. 200 cases and 200 controls will be recruited and the distance from the nearest nuclear power plant will be dichotomized as close (< 3 miles) or far (≥ 3 miles). Use SAS to complete each problem below. (a) It is believed that about 4% of controls live close to the plant and the OR that investigators would be interested in detecting is 3.5. Assuming that a 2-sided, 5% level test will be conducted, what power will the test have for detecting a significant association between cancer and proximity to the power plant? (b) If we still assume a 2-sided, 5% level test, the same exposure probability among controls, same OR, and equal numbers of cases and controls, what will the sample size need to be to have a power of 80%? (c) Since investigators find it very difficult to recruit cases, they decide to recruit three times as many…
- You have a total of 100 participants in your matched-pair design study. Your degrees of freedom would be ___.A music professor offers his 40 students the option of coming to an additional rehearsal session theweek before their juries (musical final exams.) In order to decide whether these extra sessions actuallyhelp students, he keeps track of who attends them and compares their jury scores to those of students who did not schedule extra sessions. In this study, a difference was found between the scores of students who scheduled the extra sessions and those of students who didn't attend(higher average for students with extra sessions) A) Yes, becuase the study relied on a common final exam fro everyone B)No, because the students chose whether they attended the review session or not C) Yes becuase the study included both students who attned the review session and those who did not D)Yes, becuase the number of subjects in the study was large E)No, becuase the students in the study were not blindedThe Web site www.twiigs.com allows you to voteon polls that interest you or to post one of your own. Oncec08ProducingDataSampling.indd Page 216 9/6/11 4:28:22 PM user-s163 user-F452you have found a poll of interest, you just click on “Vote,”and your response becomes part of the sample. One of thequestions in July 2010 was “How many times have you beenpulled over by the police?” Of the 780 people responding,70% said “1–5 times.” You can conclude that(a) about 70% of Americans have been pulled over by thepolice “1–5 times.”(b) the poll uses voluntary response, so the results tell uslittle about the population of all adults.(c) more people still need to vote on the question, as a largersample is required to reduce bias.
- An insurance company wishes to keep the error rates in medical claims at or below 5%. If there is evidence of an error rate greater than this, they will need to introduce new quality procedures. The company has two possible decision plans: Plan A. Randomly select 30 independent claims and audit them for errors. Use the rule: Decide error rate is acceptable if there are three or fewer errors in the sample of 30. Plan B. Randomly select 60 independent claims and audit them for errors. Use the rule: Decide error rate is acceptable if there are five or fewer errors in the sample of 60. (a) For each plan, if the probability of error is truly 5%, what is the chance they will decide their error rate is acceptable? (b) For each plan, if the probability of error is truly 15%, what is the chance they will erroneously decide their error rate is acceptable?In a lab ,the coronavirus vaccine causes negative effects in 3 out of every 100 patients . 5 people are chosen randomly Find the average number of patients that the lab should expect to experience side effects if 100 patients are randomly selectedA policeman believes that less than 40% of older drivers speed on highways, but a confidential survey found that 49 out of 88 randomly selected older drivers admitted speeding on highways at least once. Do these data provide convincing evidence that the policeman was wrong? I need the answer in State, Plan, Do, Conclude. format please
