MAT 3172, Foundations of Probability Assignment 3 2022
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MAT 3172, Foundations of Probability
Assignment 3
2022
1 Let X1 , . . . , Xn be a sample from U(0, θ).
a) If n is an odd integer, find the density of the median of the sample.
b) Show that the median of the sample converges to the median of the population in proba- bility as n 二 o.
Hint: The beta density is given by
f (x) = xα − 1 (1 - x)β − 1 , 0 < x < 1, α > 0, β > 0.
Mean= and variance= . (10 pts)
2 (Chapter 7): Theoretical Exercises: 20, 21, 49, 55, Problems: 56, 77. (10 pts) / each
3 (Chapter 6): Theoretical Exercise: 31 (10 pts)
4 The positive random variable X is said to be a lognormal random variable with parameters µ and σ 2 if log(X) is a normal random variable with mean µ and variance σ 2 .
a) Use the normal moment generating function to find the mean and variance of a lognormal random variable.
b) Given the density function
fZ (z) = exp{- IzI}, -o < z < o.
Show that M(t) = , -1 < t < 1.
c) Compute E(Z2n), n = 1, 2, ....
(20 pts)
2022-07-26