can someone tell me how to calculate the number of Fales Positive part *B* givin

Question

can someone tell me how to calculate the number of Fales Positive part *B* givin the information above ?

Thank you .

5) Cells Affected by Virus (20 points) Consider a rare virus which affects 5 in 1,000,000 Gzo7 cells. A western blot test for the virus transfection has been developed that is 80% specificity and sensitivity. a) What is the phrase used for the probability a cell that gets a negative test result is not present? (5 points) when the virus b) Calculate the number of False Positives given the information above. (10 points) in 1000 000 GZoZ

Explanation / Answer

a) Specificity is the correct answer here - it is the probability of getting a negative result given that there is no virus.

Therefore, we get here:

P( negative | no virus ) = 0.8

b) The number of false positives given the information above is computed as:

P( positive | no virus ) = 1 - P( negative | no virus ) = 1 - 0.8 = 0.2

Now here taking the total population size as 1,000,000 out of which 5 cells are infected with virus. Therefore,

Number of cells with no virus is computed as: 1,000,000 - 5 = 999,995 cells

Now 20% of the above cells will given false positives. Therefore the number of false positives here is computed as:

= 0.2*999,995

= 199999

Therefore 199,999 cells will given false positives here.

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