作者firepeter (碰碰碰碰碰)
看板NTU-Exam
标题[试题] 99上 林万寅 分析化学一 第二次小考
时间Wed Nov 24 00:12:22 2010
课程名称：分析化学一
课程性质︰化学系必带
课程教师︰林万寅
开课学院：理学万
开课系所︰化学系
考试日期（年月日）︰2010/10/11
考试时限（分钟）：15分钟
是否需发放奖励金：是
（如未明确表示，则不予发放）
试题：
1 Two students analyzed the calcium(in wt%) of a mineral knowm to contain
5.00% Ca and obtained the following results.
Student Number of measurements Confidence limit(95%)
__________________________________________________________________________
A 7 4.10~4.90
B 9 4.58~5.18
__________________________________________________________________________
(a)Do the results of the two students differ from the theoretical value at
95% confidence level? 10%
(b)Calculate the standard deviations for the results of both students 10%
(c)Calculate the pooled standard deviationfor the two students 10%
(d)Do the results of the two students differ from each other at 95% confidence
level(assuming no significant for the two standard deviations). 10%
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 140.112.250.140