A Random Sample of Medical Records from 28 Heart Attack

Multiple Choice

A random sample of medical records from 28 heart attack patients at a Boston hospital was used to better understand the relationship between cholesterol and heart failure. The cholesterol levels of heart attack patients were recorded at 2 days and at 14 days after the patient had a heart attack. Which best describes this study design?

A) Paired using repeated measures
B) Paired using matching
C) Independent groups