STA 6934 – Fall 2002 – Quiz 1Print Name: SSN:1) A study is conducted to determine whether silicone breast implants increase the risk of breast cancer. Agroup of 500 middle aged women who recently obtained implants, and a similar group (demographically) of 500women without implants are selected. The women are followed for 10 years, and are asked at follow-up if theyhave developed breast cancer. None of the women had breast cancer prior to the study. Circle the correctanswer.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 Dependent variables are:i) I: The 1000 women D: Implant statusii) I: Breast cancer status D: Implant statusiii) I: Implant status D: Breast cancer statusiv) I: The 1000 women D: Breast cancer status2) For each of the following outcomes, is it best defined as Nominal, Ordinal, Continuous, or Discrete?a) Change in diastolic blood pressure after 6 weeks of treatment.b) Number of children in a rural county coming down with mumps in a school year.c) A rating of quality of children’s health care in 3rd world countries from very poor to very good.d) The nationality of a patient suffering from a particular disease.e) The duration of erection for a male subject receiving a 50 mg dose Seldanafil.3) A diagnostic test for a particular sexually transmitted disease (STD) has a sensitivity of 95% and aspecificity of 90%. On a large singles cruise ship, 200 passengers have the STD, 800 do not. All passengers aregiven the diagnostic test and given a garnet badge (test positive) or an orange badge (test negative).a) How many people would you expect to correctly be wearing a garnet badge?b) How many people would you expect to correctly be wearing an orange badge?c) How many people would you expect to incorrectly be wearing a garnet badge?d) How many people would you expect to incorrectly be wearing an orange badge?e) Given you are paired with a date with an orange badge, what is the probability (s)he does not have theSTD?f) Given you are paired with a date with a garnet badge, what is the probability (s)he does have the STD?4) A sample of n = 6 adults who have been taking a test drug for weight loss are observed after 5 weeks tohave the following weight losses: 10, 5, 1, 15, and 9 pounds, respectively. Give the mean, median, and standarddeviation of the weight losses.5) A Swedish randomized clinical trial involved subjects receiving either aspirin or placebo. Of the 676 whoreceived aspirin, 18 suffered death due to myocardial infarction (MI)within 3 years. Among the 684 receivingplacebo, 28 died from MI. Complete the following table by showing how many subjects fall in each cell. Givethe sample proportions of deaths due to MI for each treatment group.MI Death No MI DeathAspirinPlaceboˆπAspirin=ˆπPlacebo=6) Among a large population of health professionals (excluding physicians) in a city, salaries are approximatelynormal with a mean of $80,000 and a standard deviation of $20,000.a) What proportion of health professional have salaries above $100,000?b) What proportion make below $50,000?c) Give a range of salaries that includes the middle 95% of health professionals in this city.d) If we took a random sample of n = 100 health professionals from this population, the probability thesample mean falls in the range (A, B) is approximately .95. Assuming A and B are equal distance from themean, give A and B.A =B