In: Statistics and Probability
Let X1, X2, … , X8 be a random sample of size 8 from a distribution with probability density function

where x ≥ 1. What is the likelihood ratio critical region for testing the null hypothesis ??: ? = 1 against ?1: ? ≠ 1? If ? = 0.1, determine the best likelihood ratio critical region?
Answer:
Given that,
Let X1, X2, … , X8 be a random sample of size 8 from a distribution with probability density function,

where ? ≥ 1.
What is the likelihood ratio critical region for testing the null hypothesis ??: ? = 1 against ?1: ? ≠ 1? If ? = 0.1, determine the best likelihood ratio critical region:
For testing hypothesis:

Vs

=0.1
Now,


The likelihood function of sample is,

Now, n=8

Now,


We know that,




Therefore,

i.e,

i.e, 
We reject H_0 for smaller values of 
.
We reject H_0 for

Now,
The test function is,
