STA 6934 – Fall 2003 – Quiz 1Print Name: UFID:1) A study was conducted to determine whether use of a weight control drug is related to men’s hair turninggreen. A group of 100 men with green hair were identified, and a similar group (with respect to age and otherdemographic characteristics) of men who’s hair had not turned green were identified. Each man was askedwhether they had been using the weight control drug. Circle the best answer.a) This is an example of what type of study design?i) Case-Control Studyii) Cohort Studyiii) Randomized Clinical Trialiv) Cross-Sectional Studyb) The Independent and Dep endent variables are:i) I: Green Hair Status D: Weight Control Drug Statusii) I: Green Hair D: Used Weight Control Drugiii) I: Weight Control Drug Status D: Green Hair Statusiv) I: The 200 men D: Green Hair Status2) For each of the following outcomes, is it best defined as Nominal, Ordinal, Interval?a) Body mass index.b) Attitude toward use of birth control from very favorable to very opposed.c) Whether or not a subject receiving a test drug has a particular adverse side effect.d) The change in diastolic blood pressure for a patient on a new treatment.e) The nationality of a patient suffering from a rare condition.3) A sample of n = 5 adults who have been taking a test drug for weight loss are observed after 5 weeks tohave the following weight losses: 6, 9, -2, 8, and 9 pounds, respectively. Give the mean, median, and standarddeviation of the weight losses. What is the sample proportion that lost weight?4) In a hospital in Hong Kong where the SARS virus was spread, health care workers were identified by jobcategory and whether they contracted the SARS virus. For two categories, the results are given below.Job SARS No SARSPhysicians 7 131Non-Physicians 33 882a) What is the probability a randomly selected worker is a Physician?b) What is the probability a randomly selected worker is a Non-Physician?c) What is the probability a Physician contracted SARS?d) What is the probability a Non-Physician contracted SARS?5) A diagnostic test is given to every inhabitant of an island. There are 1000 inhabitants, of which 250 havethe disease being tested for. The test has 90% sensitivity and 80% specificity. Complete the following tablewhere T represents test result, and D represents disease status.D+D−T+T−Give the positive and negative predictive values of the