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Time, Years Number at Risk Nt Number of Deaths Dt Number Censored Ct Survival Pr

ID: 2925087 • Letter: T

Question

Time, Years

Number at Risk

Nt

Number of Deaths

Dt

Number Censored

Ct

Survival Probability

St+1 = St*((Nt-Dt)/Nt)

0

25

1

1.2

25

1

0.960

2.5

24

1

0.920

3.4

23

1

0.920

4.1

22

1

0.920

4.2

21

1

0.920

4.3

20

1

0.874

5.6

19

1

0.828

5.7

18

1

0.828

5.9

17

1

0.828

6.3

16

1

0.828

6.4

15

1

0.828

6.5

14

1

0.828

6.7

13

1

0.764

7.3

12

1

1

0.700

8.1

10

1

0.630

8.2

9

1

0.630

8.6

8

1

0.630

8.9

7

1

0.630

9.4

6

1

0.630

9.5

5

1

0.630

10.0

4

4

0.630

Referring to the graph above:

What is the probability of surviving 6.5 years?

A. 0.35

B. 0.15

C. 0.99

D. None of the above

Patients have an 85% chance of surviving how many years?

A. 6.0

B. 4.25

C. 3.2

D. 5.5

Time, Years

Number at Risk

Nt

Number of Deaths

Dt

Number Censored

Ct

Survival Probability

St+1 = St*((Nt-Dt)/Nt)

0

25

1

1.2

25

1

0.960

2.5

24

1

0.920

3.4

23

1

0.920

4.1

22

1

0.920

4.2

21

1

0.920

4.3

20

1

0.874

5.6

19

1

0.828

5.7

18

1

0.828

5.9

17

1

0.828

6.3

16

1

0.828

6.4

15

1

0.828

6.5

14

1

0.828

6.7

13

1

0.764

7.3

12

1

1

0.700

8.1

10

1

0.630

8.2

9

1

0.630

8.6

8

1

0.630

8.9

7

1

0.630

9.4

6

1

0.630

9.5

5

1

0.630

10.0

4

4

0.630

0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 2 3 4 10 Time, Years

Explanation / Answer

1) P(6.5) = 828

D. None of the above

2) P(X) = 0.85 falls between 4.3 and 5.6

Therefore only option is D. 5.6

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