a) P(Reject)=P(Reject)*P()+P(Reject)*P()
=0.05*p0+pA
P(/Reject)= P(Reject)*P() /P(Reject)
=pA/(0.05*p0+pA)
b) P(/Reject) =pA/(0.05*p0+pA)=0.75*0.2/(0.05*0.8+0.75*0.2)=0.7895
c) If is unknown then P(/Reject) =*0.2/(0.05*0.8+0.2)
The above function is maximum at the maximum value of which is 1
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