NYHA I NYHA II NYHA III NYHA IV Total Age < 40 years 100 50 20 10 180 Age 40 yea
ID: 3200820 • Letter: N
Question
NYHA I
NYHA II
NYHA III
NYHA IV
Total
Age < 40 years
100
50
20
10
180
Age 40 years
100
100
80
40
320
Total
200
150
100
50
500
Suppose all 500 patients from the heart clinic in problem 2 {numbers shown in table above} (call it clinic A) also went to another clinic (call it clinic B) and had their NYHA class evaluated. Clinic B does not see other patients, so the patient population for clinic A and clinic B is the same. Clinic B determined that 260 patients have NYHA class I and 240 do not have NYHA class I.
a) (*1 pt) According to clinic B, what is the probability that a randomly selected p
Given the information in problem 2 and problem 3 so far, can you determine how likely a patient would be diagnosed with NYHA I at clinic B if they were diagnosed with NHYA I at clinic A?
NYHA I
NYHA II
NYHA III
NYHA IV
Total
Age < 40 years
100
50
20
10
180
Age 40 years
100
100
80
40
320
Total
200
150
100
50
500
Explanation / Answer
According to clicnic B the probability that a selected person has NYHA class I is : 260/500 = 0.52
.
Since there is no link between the BYHA class I patients of Clinic A and Clicnic B , thus these two events are independent and the probability tha a patient would be diagnonsed with NYHA I at clicnic B = 0.52 only , since it is not influence by the outcome of clinic A.
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