An automated blood-pressure machine classifies people as having either high blood pressure or normal blood pressure. In clinical trials on adults the ma- chine classified 88% of hypertensives as having hypertension, and classified 22% of healthy peo- ple, i.e. without hypertension, as having hypertension. Health officials are considering using the machine for screening an adult population in which 18% of persons have hypertension.

Structure the above information using a contingency table.