In a case-control study, 317 patients suffering from endometrial cancer werematched individually with 317 other cancer patients in a hospital and the use ofestrogen in the six months prior to diagnosis was determined. Estrogen isassociated with several types of cancer. The findings are shown below:ControlsNo estrogen143180CasesEstrogenNo estrogenEstrogen6725i State the null and alternative hypothesisPerform the appropriate test of significanceii.b) In a genetics experiment, investigators looked at 300 chromosomes of a particulartype and counted the number of sister-chromatid exchanges on each. A Poissonmodel was hypothesized for the distribution of the number of exchanges. Wasthe hypothesis valid given the data below:Number of exchanges34.6.7.8.9.6.24425962444114Counts2.6.く

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In a case-control study, 317 patients suffering from endometrial cancer were matched individually with 317 other cancer patients in a hospital and the use of estrogen in the six months prior to diagnosis was determined. Estrogen is associated with several types of cancer. The findings are shown below: Cases Estrogen 67 25 Controls No estrogen 143 Estrogen No estrogen 180 i. State the null and alternative hypothesis ii. Perform the appropriate test of significance mO of a particulan

In a case-control study, 317 patients suffering from endometrial cancer were matched individually with 317 other cancer patients in a hospital and the use of estrogen in the six months prior to diagnosis was determined. Estrogen is associated with several types of cancer. The findings are shown below: Cases Estrogen 67 25 Controls No estrogen 143 Estrogen No estrogen 180 i. State the null and alternative hypothesis ii. Perform the appropriate test of significance mO of a particulan

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Sleep apnea is a disorder in which there are pauses in breathing during sleep. People with this condition must wake up frequently to breathe. The article “Postoperative Complications in Patients With Obstructive Sleep Apnea Syndrome Undergoing Hip or Knee Replacement: A Case-Control Study” (R. Gupta, J. Parvizi, et al., Mayo Clinic Proceedings, 2001:897–905) reported that in a sample of 427 people 65 and over, 104 of them had sleep apnea. a) Find a 95% confidence interval for the proportion of those 65 and over who have sleep apnea. b) Find a 99% confidence interval for the proportion of those 65 and over who have sleep apnea. c) Find the sample size needed for a 95% confidence interval to specify the proportion to within ±0.03. d) Find the sample size needed for a 99% confidence interval to specify the proportion to within ±0.03.
PM Wed Nov 3 Stats Home Insert Draw View 8). Studies have shown that drivers who use cell phones while operating a motor passenger vehicle increase their risk of an accident. To quantify this risk, the New England Journal of Medicine (January 2, 2014) reported on the risk of a crash (or near crash) for both novice and expert drivers when using a cell phone. In a sample of 371 cases of novices using a cell phone while driving, 24 resulted in a crash (or near crash). In a sample of 1,467 cases of experts using a cell phone while driving. 67 resulted in a crash (or near crash). a). Find a 93% confidence interval for p, the true crash risk (probability) for novice drivers, also indicating the ME value. Answer: ME = b). Find a 93% confidence interval for p, the true crash risk (probability) for expert drivers, also indicating the ME value. Answer: гр, ME =
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Acne is a common skin disease that affects most adolescents and can continue into adulthood. A study compared the effectiveness of three acne treatments and a placebo, all in gel form, applied twice daily for 12 weeks. The study's 517 teenage volunteers were randomly assigned to one of the four treatments. Success was assessed as clear or almost clear skin at the end of the 12 week period. The results of the study can be seen in the table below. Using the appropriate statistical test, determine if there is significant evidence that the four treatments perform differently. If so, how do they compare.
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From the same cohort, all cases and 10 controls per case were chosen for analysis. The following results were observed. Serum Level of Vitamin D Incident Cases of MS Healthy Individuals Above 40 ng per ml 40 20-40 ng per ml 4 40 Below 20 ng per ml 4 20 What is the odds ratio for individuals with serum levels of vitamin D of 20-40 ng per ml? O 4.0 О 30 O 1.0 O 2.0 2.
A researcher surveyed randomly selected Democrats and Republicans asking them what the number one concern should be for the president of the United States. The results of the survey are shown below. Is there evidence to conclude that there is a difference in what Democrats and Republicans think is the most important? Economy Foreign Affairs Family Values Environment Other Democrats 82 58 80 70 44 Republicans 106 78 94 57 38 What can be concluded at the αα = 0.05 significance level? What is the correct statistical test to use? Goodness-of-Fit Independence Homogeneity Paired t-test The test-statistic for this data = (Please show your answer to three decimal places.) The p-value for this sample = (Please show your answer to four decimal places.) The p-value is αα
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A study in a journal published by the American Academy of Pediatrics (as reported in the Miami Herald, Jan. 14, 1997) seems to suggest that preschoolers who drink more than 12 ounces of fruit juice a day tend to be heavier and shorter than preschoolers who do not. The study involved a random sample of 168 healthy youngsters of whom 59 drank on average more than 12 ounces of fruit juice per day. Each child was weighed and measured. The measurements were then converted to percentage of normal height and weight for a child of that age and gender. For example, a weight percentage of 1.1 indicates that the child is 10% heavier than average. A recorded 0.80 indicates the child is 20% below the average. An average weight is recorded as 1.0. Same with height. Column 1: Juice 1- indicates child DID drink > 12 oz 2- child DID NOT drink > 12 oz Column 2: Weight% weight converted to percent of…
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