P (g1 nS < s < g2 nS) = a. (41)
a g1 g2 . IV.
. IV.
1. , 5 , 2. s 0.95. . IV n = 5 a = 0.95 g1 = 0.6 g2 = 2.9.
s 0.95 :
0.6´2 < s < 2.9´2 1.2 < s < 5.7.
, , s, ( 2 1.2 2 5.7).
2. 40 g1 = 0.8, g2 = 1.3 s
1.6 < s < 2.6.
.
n = 40 (38),
40 S s = s/[2×(n 1]1/2 = 2/781/2 2.
0.95 ss, s 0.95 : 1.55 < s < 2.45.
, , , . , 5 10 .
, : n 1, n 2 . n 1 S 12 n 2 S 22.
, S 12 S 22. J :
J = [(n 2 3)/(n 2 1)]´[ n 1 S 12/ n 2 S 22]. (42)
,
sJ = [2×(n 1 + n 2 4)/(n 1 1)(n 2 5)]1/2.(43)
R = |J 1|/sJ.
, S 12 S 22. R > 3, S 1 S 2 . R < 3, . , .. [15] , 0.01. (., , [l8] . . [11].
: 20 , 13. .5.
5.
C, % | C, % | ||||
1 | 2 | 1 | 2 | ||
4.40 | 4.42 | 4.66 | 4.57 | ||
4.66 | 4.47 | 4.53 | 4.58 | ||
4.42 | 4.70 | 4.90 | 4.66 | ||
4.59 | 4.72 | 4.50 | |||
4.55 | 4.53 | 4.66 | |||
4.45 | 4.55 | 4.80 | |||
4.55 | 4.60 | 4.36 | |||
4.39 | 4.64 | 4.75 | |||
4.75 | 4.29 | 4.28 | |||
4.72 | 4.52 | 4.45 |
S 12 /S 22 = 2.12, 1 = 20, n 2 = 13, J = 1.77, sJ = 0.62, R = 1.24 < 3.
|
|
, .
9.
< x >1 < x >2. , < x >1 n 1 < x >2 n 2 . < x >1 < x >2 , ?
, , |< x >1 < x >2| .
S 12 S 22 x 1 i x 2 k
n 1 S 2 = i S 1(< x >1 x 1 i )2/(n 1 - 1) n 2 S 2 = i S 2(< x >2 x 2 k )2/(n 2 1) (44)
S 2 (< x >1 < x >2)
S 2 = [(n 1 1) S 12 + (n 2 1) S 22]/[(n 1 1) + (n 2 1)].
,
t = [(< x >1 < x >2)/ S ]×[ n 1 n 2/(n 1 + n 2)]1/2 (45)
, .
, , .5.
< x >1 = 4.5655, < x >2 = 4.5577, <x>1 < x >2 = 0.008.
20 S 2 = 0.003, 13 S 2 = 0.014, S 2 = (0.003´19 + 0.014´13)/31 = 0.008.