gray10
Forum Junior
Topics: 4
Posts: 72
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this is really a bio stats qs
but I thought the smart guys and girls in Genetics can give us the rt solution.
?why is there not decrease risk for pt if they survive the first yr.
16. The table shows survival information for patients who had an operation for a particular form of cancer:
Patients Patients Patients
at the Beginning Who Died During Surviving
Interval of the Interval the Interval This Interval (%)
0-1 year 500 100 80
1-2 years 400 50 87.5
2-3 years 350 35 90
3-4 years 315 31 90
Based on this information, if a patient survives for 1 year, which of the following is the probability that he or she will survive for 4 years?
A ) (0.875 – 0.8) × 0.9 = 0.0675
B ) 0.8 × 0.875 × 0.9 × 0.9 = 0.567
C ) 0.875 × 0.9 = 0.7875
D ) 0.875 × 0.9 × 0.9 = 0.7088
E ) 0.9
?why is the answer B?
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