ͶʵЭCovR1,R2=0.09×0.09×12=0.0081×12
ͶϵķVp=50%2×9%2+50%2×9%2+2×50%×50%×CovR1,R2
=0.00405+0.5CovR1,R2
Ͷϵı
ϵΪ0.4ϵЭ=0.4×9%×9%=0.00324ϵķ=50%×9%2+50%×9%2+2×50%×9%×50%×9%×0.4=0.00567ϵı
⣺ijҵͶABͶĿй£
|
Ŀ |
A |
B |
|
10% |
18% | |
|
|
12% |
20% |
|
Ͷʱ |
0.8 |
0.2 |
|
ABϵ |
0.2 | |
Ҫ
1ͶAB
𰸣=Ȩƽ=10%×0.8+18%×0.2=11.6%
2ABЭ
𰸣Э=12%×20%×0.2=0.48%
3ABϷٷλλС
𰸣Ϸ=
= =1.2352%
4ABϱٷλλС
𰸣
ۣ
1Ͷʲ֮ϵΣֻҪͶʱ䣬ʲʲ䣬ϵʾͲ䡣
2ϵΪ+1ʱʲʵı仯䶯ȫͬһͬ½ܵκͶʷգʱı
ϵΪ-1ʱպ෴ʲʵı仯䶯ȫ෴Ϊ˼ȫȫͶʷգʱıС
ϵ0+1Χڱ䶯ʱʲ֮عϵ֮س̶ԽͣͶϿɷɢͶʷյЧԽ
ϵ0- 1Χڱ䶯ʱʲ֮Ǹعϵ֮ĸس̶ԽֵͣԽСͶϿɷɢͶʷյЧԽС
ϵΪʱʲ֮صġͶϿɷɢͶʷյЧʱЧҪȸʱЧҪС
ϱļ㹫ʽ
4.ͶϷյķ༰ص
Ͷϵܷɷϵͳպϵͳɡ
ϵͳգɷɢգָijһضԭijһضʲӰĿԡͨɢͶʣϵͳԷܹͣɢЧĻַվܱȫϵͳյľ幹ݰӪպͲ֡
ֵעǣڷշɢУӦֿͶʶԺͶĿãͶͶĿӵijڣշɢЧӦȽԣӵһ̶ȺշɢЧӦ
ϵͳգɷɢգָг仯гʲʵı䶯ԣЩӰгķģֳΪгաϵͳӰʲķգܱɢ
ڡʱʲģ
Ҫݣ
һϵ
ʱʲģ
һϵ
һʲĦϵ˽⣩
1.
ʲĦϵָԷӳʲгȫʲƽ֮䶯ϵһָ꣬ʲϵͳնгƽյӰ̶ȣҲΪϵͳָ
2.
ʽ1
ʽ2
3.
=1ʱʾõʲгƽʳͬı仯гͶϵķһ££1˵õʲķմгͶϵķգ£1˵õʲķճ̶СгͶϵķա
ͶϵĦϵգ
1.
ͶϵĦϵеʲϵļȨƽȨΪʲͶռıء
2.㣺
P192[5-3]ͶϵĦϵļ㷽--һ
ijͶABCʲɣйػĸʲĦϵֱΪ0.51.01.2ٶʲͶеıطֱΪ10%30%60%
ҪͶϵĦϵ
⣺⣬ У
3.ӰأͶϵĦϵܵʲĦϵʲͶռصӰ졣
1ͶAB
𰸣=Ȩƽ=10%×0.8+18%×0.2=11.6%
2ABЭ
𰸣Э=12%×20%×0.2=0.48%
3ABϷٷλλС
𰸣Ϸ=
= =1.2352%
4ABϱٷλλС
𰸣
ۣ
1Ͷʲ֮ϵΣֻҪͶʱ䣬ʲʲ䣬ϵʾͲ䡣
2ϵΪ+1ʱʲʵı仯䶯ȫͬһͬ½ܵκͶʷգʱı
ϵΪ-1ʱպ෴ʲʵı仯䶯ȫ෴Ϊ˼ȫȫͶʷգʱıС
ϵ0+1Χڱ䶯ʱʲ֮عϵ֮س̶ԽͣͶϿɷɢͶʷյЧԽ
ϵ0- 1Χڱ䶯ʱʲ֮Ǹعϵ֮ĸس̶ԽֵͣԽСͶϿɷɢͶʷյЧԽС
ϵΪʱʲ֮صġͶϿɷɢͶʷյЧʱЧҪȸʱЧҪС
ϱļ㹫ʽ
4.ͶϷյķ༰ص
Ͷϵܷɷϵͳպϵͳɡ
ϵͳգɷɢգָijһضԭijһضʲӰĿԡͨɢͶʣϵͳԷܹͣɢЧĻַվܱȫϵͳյľ幹ݰӪպͲ֡
ֵעǣڷշɢУӦֿͶʶԺͶĿãͶͶĿӵijڣշɢЧӦȽԣӵһ̶ȺշɢЧӦ
ϵͳգɷɢգָг仯гʲʵı䶯ԣЩӰгķģֳΪгաϵͳӰʲķգܱɢ
ڡʱʲģ
Ҫݣ
һϵ
ʱʲģ
һϵ
һʲĦϵ˽⣩
1.
ʲĦϵָԷӳʲгȫʲƽ֮䶯ϵһָ꣬ʲϵͳնгƽյӰ̶ȣҲΪϵͳָ
2.
ʽ1
ʽ2
3.
=1ʱʾõʲгƽʳͬı仯гͶϵķһ££1˵õʲķմгͶϵķգ£1˵õʲķճ̶СгͶϵķա
ͶϵĦϵգ
1.
ͶϵĦϵеʲϵļȨƽȨΪʲͶռıء
2.㣺
P192[5-3]ͶϵĦϵļ㷽--һ
ijͶABCʲɣйػĸʲĦϵֱΪ0.51.01.2ٶʲͶеıطֱΪ10%30%60%
ҪͶϵĦϵ
⣺⣬ У
3.ӰأͶϵĦϵܵʲĦϵʲͶռصӰ졣
