A doctor is studying the relationship between blood pressure and heartbeat abnor

Question

A doctor is studying the relationship between blood pressure and heartbeat abnormalities in her patients. She tests a random sample of her patients and notes their blood pressures (high, low, or normal) and their heartbeats (regular or irregular). She finds that: 14% have high blood pressure. 22% have low blood pressure. 15% have an irregular heartbeat. Of those with an irregular heartbeat, one-third have high blood pressure. Of those with normal blood pressure, one-eighth have an irregular heartbeat. Draw a two-way contingency table of blood pressure vs. heartbeat.

Explanation / Answer

Put the given probabilities into a matrix with rows representing blood pressure (high, normal, low) and columns representing heartbeat (irregular, regular). Use the fact that the sum of all entries must be 100 percent, ?ll out the remaining entries, and read o? the entry corresponding to low blood pressure and regular heartbeat

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