2.设总体X的分布列为-|||-(X=k)=(k-1)(theta )^2((1-theta ))^k-2 =2, 3,···, lt theta lt 1,-|||-试求未知参数θ的矩估计量。

(5)设随机变量X的分布律为 X=k =theta ((1-theta ))^k-1 ,k=1, 2,···,其中 lt theta lt 1.-|||-若

1.设随机变量X的分布律为-|||-X 1 2 3-|||-p θ^2 .theta (1-theta ) .((1-theta ))^2-|||-试求θ的矩估

13.设总体X的概率分布律为 (x,theta )=(x-1)(theta )^2((1-theta ))^x-2 x=2 ,3,···; lt theta l

1.设总体X的分布律为-|||-x 1 2 3-|||-pk θ^2 (1-theta ) ((1-{theta ))^2}-|||-其中, theta (0l

4.设总体密度函数如下,x1,···,xn是样本,试求未知参数的矩估计.-|||-(1) (x;theta )=dfrac (2)({theta )^2}(th

15.设总体X的概率分布为-|||-X 1 2 3-|||-概率 θ^2 theta (1-theta ) ((1-{e))}^2-|||-其中 theta (

4.设总体密度函数如下,x1,x2,···,xn是样本,试求未知参数的矩估计:-|||-(1) (x;theta )=dfrac (2)({theta )^2}

设总体X的分布律为-|||-x 1 2 3-|||-p θ^2 .(1-0) .((1-theta ))^2-|||-其中 theta (0lt theta l

_(1)+({k)_(2)}^2=({k)_(3)}^theta -|||-D. _(1)times ({k)_(2)}^theta =({k)_(3)}^th

_(1)^theta +(K)_(2)^theta C. _(1)^theta /({K)_(2)}^theta D. _(2)/(K)_(1)^theta