作者kcl32 ( )
看板Grad-ProbAsk
标题[问题] 北科统计
时间Fri Mar 27 01:23:28 2009
89北科工管统计No.4
Suppose an airplane has more than half of engines in operation
can fly safety.
There are two test planes(2 engine plane and 4 engine plane each).
We know these two airplanes use same engines and the probability
of safety flying of each airplane is equal.
What is the probability in operation?
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96北科工管统计No.9
An experiment is conducted to study the effects of three factors
and their interactions.
Two levels of each factor are used and two experimental runs
are made for each treatment.
The design and results are follows:
Resoponse Y X1 X2 X3
4.65 5.81 -1 -1 -1
21.42 21.35 1 -1 -1
12.66 12.56 -1 1 -1
18.27 16.62 -1 -1 1
7.93 7.88 1 1 -1
13.18 12.87 1 -1 1
6.51 6.26 -1 1 1
18.23 17.83 1 1 1
(1)What is the mean square of factor x1?
(2)What is R^2?
(3)Using the coded variables, estimate the multiple linear regression equation
y=B0+B1X1+B2X2+B3X3.What is the estimator B2?
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◆ From: 118.167.159.61
※ 编辑: kcl32 来自: 118.167.159.61 (03/27 01:24)
1F：推 chhayu:96.9这题好耗时间阿 整大题15分0rz 03/27 11:34
2F：→ s911125:其实题目不难 x1 x2 x3 加起来都是0 所以计算的时候 03/27 13:47
3F：→ s911125:可节省很多时间 前提(能用计算机) 03/27 13:48
4F：→ chhayu:是不难阿 只是按计算机也很累 n=16 y也要算0rz 03/27 17:22