Question

A program is seeded with 30 faults. During testing, 21 faults are detected, 15 of which are seeded faults and 6 of which are indigenous faults. What is the Mill's estimate of the number of indigenous faults remaining undetected in the program?

Answer 1

Estimated number of indigenous faults remaining undetected is 6

Step-by-step explanation:

The maximum likelihood estimate of indigenous faults is given by,

`N_F=n_F* (N_S)/(n_S)` here,

`n_F` = the number of unseeded faults = 6

`N_S` = number of seeded faults = 30

`n_s` = number of seeded faults found = 15

So NF will be calculated as,

`N_F=6* (30)/(15)=12`

And the estimate of faults remaining is
`N_F-n_F` = 12 - 6 = 6