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Stats assignment=The following are body mass index (BMI) scores measured in 12 patients who are free of diabetes and




Question;A. The following are body mass index (BMI) scores measured in 12 patients who are free of diabetes and participating in a study of risk factors for obesity. Body Mass Index is measured as the ratio of weight in kilogram to height I meters squared.25 27 31 33 26 28 38 41 24 32 35 40a)Compute the mean BMIb)Compute the standard deviation of BMIc)Compute the median BMId)Compute Q1 and Q3e)Are there outliers in the distribution of BMI (justify your answer0?.B. The following table shows the numbers of patients classified as underweight, normal weight, overweight, obeseUnderweight Normal Weight Overweight ObeseDiabetes 8 34 65 43No diabetes 12 65 93 40If a patient is selected at random,a)What is the probability that they are overweight?b)What is the probability that they are obese and diabetic?c)What proportion of the diabetics are obese?d)What proportion of normal weight patients are not diabetic?e)What proportion of patients are normal weight or underweight?C. Approximately 30% of obese patients develop diabetes. If a physician sees 10 patients who are obese,a)What is the probability that half of them will develop diabetes?b)What is the probability that none will develop diabetes?c)How many would you expect to develop diabetes?PART II1. A new non-invasive screening test is proposed that is claimed to be able to identify patients with impairedglucose tolerance based on a battery of questions related to health behaviors. The new test is given to 75patients. Based on each patient?s responses to the questions they are classified as positive or negative forimpaired glucose tolerance. Each patient also submits a blood sample and their glucose tolerance status isdetermined. The results are tabulated below.Screening Test Impaired Glucose Tolerance Not ImpairedPositive 17 13Negative 8 37A) what is the sensitivity of the screening test?B) What is the false positive fraction of the screening test?2. BMI in children is approximately normally distributed with a mean of 24.5 and a standard deviation of 6.2.a)A BMI between 25 and 30 is considered overweight. What proportion of children are overweight?b)A BMI of 30 or more is considered obese. What proportion of children are obese?c)In a random sample of 10 children, what is the probability that their mean BMI exceeds 25?3. A national survey is conducted to assess the association between hypertension and stroke in persons over 55 years of age. Development of stroke was monitored over a 5 year follow-up period. The data are summarized below and the numbers are in millions.Developed Stroke Did not develop strokeHypertension 12 37No Hypertension 4 264. Answer True or False to each of the followingA) If there are outliers, then the mean will be greater than the median.b) The 90th percentile of the standard normal distribution is 1.645.c) The mean is the 50th percentile of any normal distribution.d) The mean is a better measure of location when there are no outliers.


Paper#62374 | Written in 18-Jul-2015

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