Question 3. Let X1,···, Xn be a sample from the pmf Po(X = x) = α(x)0x f(0) x = 0,1,2,. " where 0 > 0, α(x) > ·0, ƒ (0) = Σa(x)0x, α(0) = 1, and let T = T(X1,···, Xn) = X. Write i=1 x = n c(t,n) = Σ П α(xi), ЄR(t) i=1 where (x1,,xn) and R(t) = {(x1,xn) EN T(x1,,xn) = t}. Show that T is a complete sufficient statistic for 0, and that the UMVUE for d(0) = 0" (r > 0 is an integer) is given by 0, if t < r, Y₁(t) = c(t,n) " c(t-r,n) if t≥ r . iid Using this result find the UMVUE of 0 when Xi ~ Poisson(0).

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Question 3.
Let X1,···, Xn be a sample from the pmf
Po(X = x)
=
α(x)0x
f(0)
x = 0,1,2,.
"
where 0 > 0, α(x) > ·0, ƒ (0) = Σa(x)0x, α(0) = 1, and let T = T(X1,···, Xn) =
X. Write
i=1
x =
n
c(t,n) = Σ П α(xi),
ЄR(t) i=1
where (x1,,xn) and R(t) = {(x1,xn) EN T(x1,,xn) = t}. Show
that T is a complete sufficient statistic for 0, and that the UMVUE for d(0) = 0" (r >
0 is an integer) is given by
0,
if t < r,
Y₁(t) =
c(t,n)
"
c(t-r,n) if t≥ r .
iid
Using this result find the UMVUE of 0 when Xi
~
Poisson(0).
Transcribed Image Text:Question 3. Let X1,···, Xn be a sample from the pmf Po(X = x) = α(x)0x f(0) x = 0,1,2,. " where 0 > 0, α(x) > ·0, ƒ (0) = Σa(x)0x, α(0) = 1, and let T = T(X1,···, Xn) = X. Write i=1 x = n c(t,n) = Σ П α(xi), ЄR(t) i=1 where (x1,,xn) and R(t) = {(x1,xn) EN T(x1,,xn) = t}. Show that T is a complete sufficient statistic for 0, and that the UMVUE for d(0) = 0" (r > 0 is an integer) is given by 0, if t < r, Y₁(t) = c(t,n) " c(t-r,n) if t≥ r . iid Using this result find the UMVUE of 0 when Xi ~ Poisson(0).
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