If X(t), t ≥ 0 is a Brownian motion process with drift parameter
μ and variance parameter σ2 for which X(0)=0, show that
-X(t), t ≥ 0 is a Brownian motion process with drift parameter -μ
and variance parameter σ2.
If X(t), t>=0 is a Brownian motion process with drift mu and
variance sigma squared for which X(0)=0, show that -X(t), t>=0
is a Brownian Motion process with drift negative mu and variance
sigma squared.
1. Let X be a random variable with mean μ and variance σ . For a
∈ R, consider the expectation E ((X − a)2)
a) Write E((X −a)2) in terms of a,μ and σ2
b) For which value a is E ((X − a)2) minimal?
c) For the value a from part (b), what is E ((X − a)2)?
2. Suppose I have a group containing the following first- and
second-year university students from various countries. The first 3...
Let μ=E(X), σ=stanard deviation of X. Find the probability P(μ-σ
≤ X ≤ μ+σ) if X has... (Round all your answers to 4 decimal
places.)
a. ... a Binomial distribution with n=23 and p=1/10
b. ... a Geometric distribution with p = 0.19.
c. ... a Poisson distribution with λ = 6.8.
Suppose that X is normally distributed with mean 0 and unknown
variance σ^2. . Then x^2/σ^2 has a χ^2 1with 1 degree of freedom.
Find
a) 95% confidence interval for σ2
(b) 95% upper confidence limit for σ2
(c) 95% lower confidence limit for σ2
Let X ∼ Normal(0, σ^2 ).
(a) Find the distribution of X^2/σ^2 . (Hint: It is a pivot
quantity.)
(b) Give an interval (L, U), where U and L are based on X, such
that P(L < σ^2 < U) = 0.95.
(c) Give an upper bound U based on X such that P(σ^2 < U) =
0.95.
(d) Give a lower bound L based on X such that P(L < σ^2 ) =
0.95
1. Suppose X follows the normal distribution with mean μ and
variance σ^2 . Then:
(Circle all that apply.)
A. X is symmetric with respect to the y-axis.
B. P(X=2)=P(X=-2).
C. Y=aX follows the same distribution as X, where a is a
constant.
D. None of the above statements is correct.
2.
Given a random variable X having a normal distribution with
μ=50, and σ=10. The probability that Z assumes a value between 45
and 62 is: ___________.
3. Which...