Pain after surgery: In a random sample of 42 patients undergoing a standard surgical procedure, 18 required medication for postoperative pain. In a random sample of 83 patients undergoing a new procedure, only 19 required pain medication. Part: 0 / 2 Part 1 of 2 (a) Construct a 90% confidence interval for the difference in the proportions of patients needing pain medication between the old and new procedures. Let p, denote the proportion of patients who had the old procedure needing pain medication. Use tables to find the critical value and round the answer to at least three decimal places. A 90% confidence interval for the difference in the proportions of patients needing pain O< P, -P2
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- Stanford University conducted a study of whether running is healthy for men and women over age 5050. During the first eight years of the study, 3.3%3.3% of the 440440 members of the 5050-Plus Fitness Association died. We are interested in the proportion of people over 5050 who ran and died in the same eight-year period. Construct a 93%93% confidence interval for the population proportion of people over 5050 who ran and died in the same eight-year period.Enter your answer in interval notation.Round your answer to four decimal places.Do not round any intermediate calculations.A study was conducted to determine if the percent of women who received financial aid is different form the percentage of men who receive financial aid. A random sample of students revealed the results shown in the table. Using (a=0.01), is there significant evidence to reject the null hypothesis? women men sample size number receiving aid 200 250. 300 225 a. Find the 90% confidence interval for the difference in financial aid rates between men and women and interpret this interval in the context of the problem. b. Write the two hypotheses for the problem. c. Compute the appropriate statistical hypothesis test and report the test statistic and p-value. d. Write the conclusion for the problem regarding the null hypothesis using statistical language.17.18 4S overall mortality. The 4S study introduced in Exercise 17.17 also tallied deaths due to any cause. The treatment group experienced 182 deaths (n1 = 2221) and the control group experienced 256 deaths (n2 = 2223). Compare the mortality experience in the two groups in the form of a relative risk and 95% confidence interval.
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Ages when Children Begin to Read Read to at Least Three Times per Week Read to Fewer than Three Times per Week Started Reading by age 44 31 45 Started Reading after age 44 47 47 Lower endpoint= upper endpointA study of 420,075 cell phone users found that 132 of them developed cancer of the brain or nervous system. Prior to this study of cell phone use, the rate of such cancer was found to be 0.0313% for those not using cell phones. Complete parts (a) and (b). a. Use the sample data to construct a 90% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system. D%A study regarding the proportion of students who finish their MS degree (graduate) is conducted in two universities (A and B). The results are shown in the following table.A psychologist is studying the effects of lack of sleep on the performance of various perceptual-motor tasks. After a given period of sleep deprivation, a measurement of reaction time to an auditory stimulus was taken for each of 36 adult male subjects. The reaction times (in seconds) are summarized as follows:x = 1.82, S=0.22. Find a 99% confidence interval for the mean reaction time for sleep-deprived male subjectA study of 420,072 cell phone users found that 135 of them developed cancer of the brain or nervous system. Prior to this study of cell phone use, the rate of such cancer was found to be 0.0336% for those not using cell phones. Complete parts (a) and (b). a. Use the sample data to construct a 95% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system. D%A study of 420,073 cell phone users found that 136 of them developed cancer of the brain or nervous system. Prior to this study of cell phone use, the rate of such cancer was found to be 0.0326% for those not using cell phones. Complete parts (a) and (b). a. Use the sample data to construct a 90% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system. D%A researcher surveys a group of college students to determine the negative life events that they experienced in the past 5 years and their current feeling of well-being. For N = 18 participants with 2 or fewer negative experiences, the average well-being score was X = 42 with SS = 398. For the N = 16 participants with 5 to 10 negative experiences the average score is X = 48.6 with SS = 370. Construct a 95% confidence interval for the difference between the population means for the two groups.Early-childhood-development studies indicate that the more often a child is read to from birth, the earlier the child begins to read. A local parents’ group wants to test this theory and samples families with young children. They find the following results. Construct a 99% confidence interval to estimate the true difference between the proportions of children who read at an early age when they are read to frequently compared to those who were read to less often, as described in the table of results. Let Population 1 be the children who were read to frequently and Population 2 be the children who were read to less often. Round the endpoints of the interval to three decimal places, if necessary. Ages when Children Begin to Read Read to at Least Three Times per Week Read to Fewer than Three Times per Week Started Reading by age 4 60 35 Started Reading after age 4 36 51 Lower end point: Upper end point:Recommended textbooks for youMATLAB: An Introduction with ApplicationsStatisticsISBN:9781119256830Author:Amos GilatPublisher:John Wiley & Sons IncProbability and Statistics for Engineering and th…StatisticsISBN:9781305251809Author:Jay L. 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