A random sample of computer users was asked which browser they primarily relied on for surfing the Internet and whether this browser was installed on a PC or on a Mac computer.The following contingency table shows these results. 
Definitions:
Bruits
Sounds heard over the arteries or veins during auscultation, indicative of abnormal blood flow, often due to narrow or blocked vessels.
Exhale
The process of releasing air from the lungs through the mouth or nose.
Tetralogy of Fallot
A congenital heart defect that includes four abnormalities: a large ventricular septal defect, pulmonary stenosis, right ventricular hypertrophy, and an overriding aorta.
Systolic Murmur
A heart sound indicating turbulent blood flow that occurs during the heartbeat's systolic phase, often implying valvular heart disease or other circulatory issues.
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