抽样技术课后习题 参考答案 金勇进
估计量的标准差为1.99%,比例为9.24% 按比例分配:
n=2663
=479,
=559,
=373,
=240,
=426,
=586
内曼分配:
n=2565
=536,
=520,
=417,
=304,
=396,
=392
5.解:由题意,有
=
=75.79
购买冷冻食品的平均支出为75.79元
又由V()=+
又n=
V()
=53.8086
=7.3354
95%的置信区间为[60.63,90.95]。 7.解:(1)对 (2)错 (3)错 (4)错 (5)对
8.解:(1)差错率的估计值=
70%+
30%=0.027
估计的方差v()==3.1967