Discussion:
Q: If X1,X2,...,Xn is a random sample of size n from a Bernoulli population with parameter p such that P(X=1)=1-P(X=0)=p. Then to test Ho: p=po, if the critical region is taken as X1+X2+...+Xn<=n-2. Find the size of the test and obtain an expression for power function.