As part of a study,investigators wanted to assess the accuracy of self reported smoking status. Participants are asked whether they currently smoke or not. In addition, laboratory tests are performed on hair samples to determine presence or absence of nicotine. The laboratory assessment is considered the gold, or truth about nicotine. The data are as follows:
Nicotine Absent Nicotine Present
Self reported Non smoker 82 14
Self reported Smoker 12 52
A. What is the sensitivity of self reported smoking status?
B. What is the specificity of self reported smoking status?