2. A public health researcher examines the medical records of a large sample of men who died in 1999. Of this sample, she finds that 22.4% died with heart disease. Further, she finds that one third of the men in the sample had at least one parent with heart disease, and of this latter group, 32.7% died of heart disease.
a) What percentage of men in the sample died of heart disease and neither parent had heart disease?
Statistics for the Behavioral Sciences - NYU Open Edu
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22.4% of the sample group died with heart disease
1/3 of the sample group had AT LEAST one parent with heart disease
(1/3) 32.7% died of heart disease.
What percentage of men in the sample
died of heart disease AND neither parent had heart disease?
P(0 parents|disease) hmmm....
lets say there are 1000 in the group so that we can forgo the decimals:
224 of them died of heart disease
333 1/3 had AT LEAST one parent with, that leaves us with
666 2/3 had NO parent with heart disease.
109 people died of disease with AT LEAST one parent having it
115 are left that died of heart disease in this scenario