所屬科目：主題課程專用
8.A population is composed of 5 numbers: 2, 4, 6, 8, 10. Let μ and σ denote mean and standard deviation of the population, and denote mean and standard deviation of the sample mnean from the population. Which of the following statement is the most correct one?
(A)μ=6,σ=3.16;(B).=6,=3.16；(C).=6,=283；(D).μ=6,σ=2.83；(E)=μ,σ = 3.16.
9.If we calculate sample mean from the population in question 8, with sample size equal to 2. Let and denote the theoretical density and cumulative distributions of the sanplemean, respectively. Which of the following statement is the most correct one?
10.If we calculate a sample mean from the population in question 8, with sample sive equal to 2. Let and , denote mean and standard deviation of the sample mean. Which of the following statement is the most correct one? (A)(B)(C) (D) = 5.5, = 1.89; (E)
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denote mean and standard deviation of the sample
mnean from the population. Which of the following statement is the most correct one? 
=6,
=3.16；(C).
=6,
=283；(D).μ=6,σ=2.83；(E)
=μ,σ = 3.16.
and 
denote the theoretical density and cumulative distributions of the sanple
(B)
(C)
(D)
(E)
and 
, denote mean and standard deviation of the sample mean. Which of the following
statement is the most correct one?
(A)
(B)
(C)
(D) 
= 5.5,
= 1.89; (E) 