Imagine that you are concerned about your risk for heart disease. You look on the Web and find a risk calculator for heart disease.
The calculator asks you some questions about your health and uses your answers to estimate how likely you are to develop certain diseases. The health questions include things like age, gender, weight, height, whether you are a smoker, and whether you have diabetes or high blood pressure.
Imagine that you have answered all the health questions.
Imagine that for the last three months, you have had a very bad headache – the worst in your life – that won’t go away, even when you take aspirin. In addition to the headache you have also been feeling dizzy.
Imagine that you are the parent of a 1-month-old infant. You are worried that an infant who is this uncomfortable, and that spits up this much, might not be healthy. So, you decided to take your infant to the doctor to be checked.