Problem 1: A new job evaluation screening test is being devised to detect hypothetical problems. One hundred jobs were selected for screening among which forty jobs were identified (known) as "high risk jobs" (cases). A job evaluation test yielded 60 positives (high risk), of which one-third were true positives. a) Calculate the sensitivity, specificity and predictive values (+) and (-) of the test. (Hint: after setting up the appropriate 2x2 table, find the missing data by subtraction). b) Discuss your results. Problem 2: In 2009, it was estimated that, in the US, 1,180,000 new cases of LBD were diagnosed. Among these 1, 180,000 new cases, 1, 020,000 of them occurred among smokers. There were 27 million smokers among the 230 million people in the US in 2005. a) What was the prevalence of smoking in the US in 2005? b) What is the relative risk of LBD for smokers compared to nonsmokers? c) Discuss your results. Problem 3: An ergonomist conducts a survey of tendonitis in a company "XYZ". The prevalence of tendonitis among men is 40/1,000 and among women is 20/1,000. a) Assuming that the data have been age adjusted, is it correct to conclude that men have twice the risk of developing tendonitis as women? b) Explain your answer.