MGT 2250 Exam Two Concepts
Variance of X
o^2
Find the item that matches the description below. The random variable X denotes a normally distributed random variable, X~Nμ, σ2. A googol is 10100. The random variable Z denotes a standard normal random variable, Z~N(0, 1). Probability of X being less than μ+σ
p(Z<1)
Shorthand notation for P(X=X)
p(x)
The random variable Z denotes a standard normal variable, Z ~ N(0,1). What is the difference between value of P(Z<−x) and P(Z>x)?
0
The random variable Z denotes a standard normal random variable, Z ~ N(0,1). What is the standard deviation of Z?
1
X denotes a normally distributed random variable: X ~ N(μ,σ2). What is the probability of X being less than its mean?
1/2
Increases the mean of X by 10
10 + X
Has 10 times the standard deviation of X
10x
Variance of X
E(x-u)^2
The random variable Z denotes a standard normal random variable, Z ~ N(0,1). What is the distribution of the random variable μ+σZ?
N(u, o^2)
Standard deviation of X
the square root of the variance
Let X denote a normally distributed random variable: X ~ N(μ,σ2). What is the mean of X?
u
X denotes a random variable.
û