Chapter 5, Practice Problem 7 Ref.Table 5-13, p99 Ref. Table 5-6, p72 Self-Reported Smoking Status Data Layout for Evaluating Screening Tests Nicotine Absent Nicotine Present Total Diseased Disease Free Total Selfreported nonsmoker 82 14 96 Screen Negative c d c+d Selfreported smoker 12 52 64 Screen Positive a b a+b Total 94 66 160 Total a+c b+d N a) What is the sensitivity of the selfreported smoking status? Sensitivity = P(screen positive | disease) = a/(a+c) 0.128 b) What is the specificity of the selfreported smoking status? Specificity= P(screen negative | dise