Suppose we observe a random variable X having the exponential distribution with parameter A, which means that X has pdf
fX(x;λ) = {λe-λx if x ≥0
{0 otherwise
(a) Find the critical region for a test that is uniformly mast powerful for testing Ho: λ= 4 against H1 : λ > 4 at level of significance .05.
(b) Find the critical region for a test that is uniformly most powerful for testing Ho : λ = 4 against H1 : λ < 4 at level of significance .05.