1.

Mention any two differences between single sampling plan and double sampling plan.

Answer»

In single sampling plan, decision about accepting or rejecting a lot is based on one sample only, whereas in double sampling plan decision is based on two samples.

In S.S.P. the lot is accepted if: d ≤ c , 

where d = no. of defectives, c-acceptance number and

In D.S.P the lot is accepted if: d1 ≤ c2 and (d1 + d2) ≤ c2

where d1,d2 – no. of defectives ; c1, c2 – acceptance number .



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