passage/resources/prelim/past... · 2018-02-20 · problem #4 on taking 3 random and independent...
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Problem #1 Evaluate the integral
!"
!!!! !! !!!!!!! .
Problem #2 Let
𝐿 = !!
!!!− !
!!, 0 ≤ 𝑥 ≤ 1.
Determine explicitly the Green’s function 𝐺(𝑥, 𝜁) which satisfies the equation
𝐿 𝐺 𝑥, 𝜁 = 𝛿 𝑥 − 𝜁
with the boundary conditions 𝐺 0, 𝜁 = 𝐺 1, 𝜁 = 0.
Problem #3 The 𝑛×𝑛 matrix 𝑄! is defined by a sum of a multiple of the unit matrix 𝐼! plus a multiple of the constant matrix 𝐶! (in which all matrix elements are equal to 1). Thus
𝑄! 𝑎, 𝑏 = 𝑎𝐼! + 𝑏𝐶!
a)� Find the eigenvalues of 𝑄!(𝑎, 𝑏) and their degeneracies.
b)� Show that the set of all such matrices is closed under matrix
multiplication.
c)� Find the inverse of 𝑄! 𝑎, 𝑏 .
Problem #4 On taking 3 random and independent draws from a Poisson distribution one obtains the numbers 18, 16, 23.
a)� Derive the maximum likelihood estimate for the Poisson parameter 𝜆.
b)� Derive the uncertainty on the maximum likelihood estimate.
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