Question

In double sampling plan if the numbers of defects is in between the two cut off numbers C1 and C2 then

Answer 1

Double and multiple sampling plans were invented to provide a questionable lot another chance.

For instance, if in double sampling the results of the first sample are not conclusive with regard to accepting or rejecting, a second sample is taken.

Application of double sampling needs that a first sample of size n1 is taken at random from the lot.

The number of defectives is then counted and compared with first sample acceptance number c1 and rejection number c2.