# Power Functions

We say a critical region C is of size  if = max P{(X1,....,Xn)  C], 0

We define the power function of a critical region to be c()= P[(X1,...Xn) C], 1

1)Let X have a pdf of the from f(x; )= x^(-1), 0<x<1, 0 elsewhere, where  {: =1,2}. To test the simple hypothesis H0: =1 against the alternative simple hypothesis H1: =2, use a random sample X1, X2 of size n=2 and define the critical region to be C= {(x1,x2): Â¾ <= x1x2}. Find the power function of the test.

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#### Solution Summary

We say a critical region C is of size a if = max P0{(X1,....,Xn) E C], 0

We define the power function of a critical region to be c()= P[(X1,...Xn) C], 1

1)Let X have a pdf of the from f(x; )= x^(-1), 0<x<1, 0 elsewhere, where  {: =1,2}. To test the simple hypothesis H0: =1 against the alternative simple hypothesis H1: =2, use a random sample X1, X2 of size n=2 and define the critical region to be C= {(x1,x2): Â¾ <= x1x2}. Find the power function of the test.