a
a
-
X1, X2
- 1) = a 1 ; E(X2) = a 2 a 1 , a 2
(n
(n<30), X~N(a,
1, n2
(n 1 + n 2 -2 30)
̅ ̅
√ ̅ ̅
̅ √
̅
̅ √
̅ 0 0
BT 1: {
BT 1: {
BT 2: { BT 2: {
BT 3: { | | | | BT 3: {
| |
–
a ,
-
- 1, X2
- X1 ~ N(a1 ; ) ; X2 ~ N(a2 ; )
/ a ch
̅
1, n2
kê ̅
̅ 0 0
BT 1: {
BT 1: {
BT 2: {
BT 2: {
BT 3: {
̣ BT 3: {
̣ }