Some people have white coat hypertension. That is, they are anxious when visiting a medical office and, as a result, their blood pressure increases when a person with a white lab coat and a stethoscope walks into the room to take a blood pressure. To see whether his patients experience white coat hypertension, a family practitioner takes two blood pressure measurements – one when first walking into the room and a second, unexpected, one after about 15 minutes have passed. What statistical test is the most appropriate to answer the research question