Evaluate the rate of error

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In order to evaluate the rate of error experienced in reading chest x-rays, the following experiment is done. Several people with known tuberculosis (TB) status (through other reliable tests) are subjected to chest x-rays. A technician who is unaware of this status reads the x-ray, and Table gives the result. Here +x-ray means the technician concluded that the person has TB.

Table

 

Person  without TB

Person with TB

Total

+X-ray

70

27

97

-X-ray

1883

20

1903

Total

1945

55

2000

Find (aP(TB|+ ray), (bP(+X ray|No TB), and (cP(No TB|- ray).

Reference no: EM13963656

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