3
, n1 n2 , X0 s2.
S1 S2 . Xcp1 Xcp2,
s12/n1+s22/n2 = (n1 + n2)s2 /n1n2
S12 S22 s2 n1 -1 n2 -1, s2
S2 =[(n1 -1)S12 +(n2 -1)S22]/[(n1 -1)+(n2 -1)] =
= [S(X-Xcp)2 +S(X-Xcp)2]/(n1 +n2 -2)
t = [(X2 -Xcp1)/S][n1n2 /(n1 +n2)]^0.5
t n1+n2 -2.
t=2,8, t=2,567 n=18 P=0,02. .. t, t . , .
4
. .
, . xz (, 255).
: , Δ=- z (5). , (),
=(-)/Sx..
15 S .
(Δ<=5)=2(5/σ)=Y. (Δ>=5)=1-Y.
2(5/2,36)=2*0,482=0,964 =1-0,964=0,036 =3,6%
5.
. .
1 2. S1 S2. , σ.
F=S12/S22. F . E F , , ( ) .
. , , , , ( ), .
. , () , .
|
|
, t.
S2
S2 =[(n1 -1)S12 +(n2 -1)S22]/[(n1 -1)+(n2 -1)] =
= [S(X-Xcp)2 +S(X-Xcp)2]/(n1 +n2 -2)
t.
t = [(X2 -Xcp1)/S][n1n2 /(n1 +n2)]1/2
t , .
.
F 5% n1=n2=12 F=2,54.
t 5% n1=n2=12 t=2,201.
: . 1 2, S1 S2 F t .
6.
. .
, , , .
.
Q=(-)/R R- R=-
Q n, , , .
. Q α
n | α=0,01 | Α=0,05 | α =0,1 |
0,99 | 0,94 | 0,89 | |
0,76 | 0,64 | 0,56 | |
0,58 | 0,48 | 0,40 |
, , .
. (. 5) .
n , m .
= ΣXi/m
Si2=Σ(Xcp-Xi)2/(m-1)
n
Sc2= Σ Si2
n
G=Simax2/Sc2
G G m n .
G ( 0,05) G<G, , 95%.
.
7.
. .
Y=b +b1X, Y X.
:
Syi - S(b +b1X) = 0 /b0 = S(yi -(b0+b1xi)) = 0
Sxiyi - S(b0+b1xi) =0 /b1 = S(yi -(b0+b1xi)xi ) = 0
|
|
b = [SxiSyi - NSxiyi ]/[ (Sxi)2-NSxi2]
b0 =Ycp-b1Xcp
R = [S(xi -xcp)(yi -ycp)]/(n-1)SxSy -1£R£+1
R=b1Sx/Sy = b1{[nSxi2 -(Sxi)2 ]/[nSyi2 -(Syi)2 ]}1/2
:
S(xi+yi)2 = Sxi2 + 2Sxiyi + Syi2
, S2
S2 = [S(yi-Ycp)2]/(n-1)
S2 = [SS(yin -Yicp)2]/(Smi -L)
L - .
Y(X)
Y | x*y | x*x | y*y | |
11,5 | 132,25 | |||
Sum=42 | 64,5 | 753,25 |
Y=4,3+0,9214*X
R=b1*((nSxi^2-(Sxi)^2)/(nSyi^2-(Syi)^2))^0,5 | ||||
R=0,9214*((6*364-42^2)/(6*753,25-64,5^2))^0,5 | ||||
R=0,996264 | ||||
R^2=0.99254