fusion
Forum Newbie
Topics: 2
Posts: 2
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The table shows survival information for patients who had an operation for a particular form of cancer:
Interval Patients at the Beginning of the Interval Patients Who Died During the Interval Patients Surviving 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) X 0.9 = 0.0675
B. 0.8 X 0.875 X 0.9 X 0.9 = 0.567
C. 0.875 X 0.9 = 0.7875
D. 0.875 X 0.9 X 0.9 = 0.7088
E. 0.9
F. 0.9 X 0.875 = 0.025
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| Addicudo
Forum Guru
Topics: 124
Posts: 615
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D. 0.875 X 0.9 X 0.9 = 0.7088
Could have been B too .. BUt since the question asks if the pt survives for ONE year .. so our calculation of probability will start from the second year.. as ONE who didnt SURVIVE ... there is no probability ... BUT for those who did ... WE TAKE THEM AS 100% and then start our calculation ..
I hope I do make sense in this one !!
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... Idle hands are the DeVilS play ground ...
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| lq2006
Forum Elite
Topics: 43
Posts: 382
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B. 0.8 X 0.875 X 0.9 X 0.9 = 0.567
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