作者Qaz168 (小黑)
站内Statistics
标题[问题] 区间估计
时间Mon Nov 2 01:23:19 2009
A quality engineer wanted to be 98% confident that the maximum error
of the estimate of the mean strength, μ, of the left hinge on a vanity
cover molded by a machine is 0.25. A preliminary sample of size n=32
_
parts yielded a sample mean of x=35.68 and a standard deviation of
s=1.723
How large a sample is required ?
请问题目是什麽意思??
of the left hinge on a vanity cover molded by a machine is 0.25.
这句实在不懂
谢谢~
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◆ From: 219.70.177.235
※ 编辑: Qaz168 来自: 219.70.177.235 (11/02 01:37)
※ 编辑: Qaz168 来自: 219.70.177.235 (11/02 02:09)
1F：→ yhliu:μ 之 98% CI 的误差设定为 0.25. 已知 n=32 时一个样本得 11/03 08:37
2F：→ yhliu:s=1.723. 问: 需多大样本才能符合上述要求? 11/03 08:38
3F：→ Qaz168:好 谢谢 11/03 23:02