Just want to ask the part (a) and part (d). I\'m really confused about the popul
ID: 3073748 • Letter: J
Question
Just want to ask the part (a) and part (d). I'm really confused about the population and the sample. We are just provided the information of hypertensive in sample, but not in the population.
A recent screening study for hypertension was performed among adults under age of 60 who are selected from the Washington Heights community. Out of 6,000 adults that were screened, 650 were found to have a diastolic blood pressure (DBP) of 90mmHg or higher. A random sample of 100 adults from those with DBP 90mmHg or higher and another random sample of 100 adults from those with DBP less than 90mmHg were sent to further investigations, and 75 and 15 of the respective samples were confirmed as hypertensive. Extract the relevant information from the problem and answer the following questions. Where the case, also provide the clinical/epidemiological term of that specific probability. a) What is the probability that an adult having DBP 2 90mmHg at screening will actually be hypertensive? (2p) b) What is the probability that an adult having DBPExplanation / Answer
a)
P(actually hypertensive) =P(tested hypertensive and actually hypertensive)+P(not tested hypertensive and actually hypertensive) =(650/6000)*(75/100)+(1-650/6000)*(15/100)=0.215
d)
P(tested hypertensive|actually hypertensive)
=P(tested hypertensive and actually hypertensive)/P(actually hypertensive)
=(650/6000)*(75/100)/0.215 =0.3779
( please revert for any clariifcation required)
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