, t- 9.1.1 t, . ( , , n-1.) , 95% n = 23, t = 1,717. 99,9% = 35 t = 3,348.
:
95% ,
- t.
95% ,
+ t.
, , , . ( , .) , ( , ), , ( , ), .
. 9.4.1 , - .
90% . |
95% , |
95% , |
. 9.4.1. . , . , 95% 90% .
. , ( ), . , , 19,0, , 8,26, , 2,81 35,2, , 5,41. , 5,41, , , 2,81. , .
.
|
|
, , . , . , .
? , , , . , , .
? , , , . : " 95% , ...".
n = 18 = $39,21 =$6,40 ,
- t. =39,21 (1,740)(6,40) = 28,07.
.
95% , , $28,07 .
, = $39,21, . , = $39,21 , $28,07. . .
, t-. , 99% t = 2,567. 95% , .
99% , $22,78 .
, . , . , . , , = S / ( ), S .
|
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, , . , . , 1,...,. , .
, .. . : . (1 +1/ ).
S
S . , ( S) ( = S / ).
, , . t - (, ). ; , , .
:
95% ,
-tS + tS
95%? , : , , , . , 95% , . , , , , , . , , 95% ( ).
.
? , , , , , . , .
: " ". , , :
10, 9, 7, 10, 3, 9, 12, 5
= 8,125 S = 2,94897. = 1,04262, . .
=S = 2,94897 = 3,12786.
95% t - n = 8 t = 2,365.
8,125-(2,365) (3,12786) = 0,728
8,125+(2,365) (3,12786) = 15,52.
, . 8 " " . .
|
|
" 95% , 0,7 15,5 .
? . 8 . , .
, , , t = 1,895, 95% .
+ t.( ) = 8,125 + (1,895)(3,12786) = 14,05229.
.
95% , 14 .
90% , ( t = 1,415) :
+ t.( ) = 8,125 + (1,415)(3,12786) = 12,55092.
.
90% , 12,6 .