: () 1- 1, 2 (. III).
: ) 1- 2- ;
) , .
: Excel, . , , _. , , .
) p <0,05, .. 95%, M 2 m, M , m .
1- M1 =121,9, m 1 =1,64. .. 121,9 2*1,64 = 121,9 3,28 /. Excel =121,9+3,28 =121,9-3,28. 1- 118,62 125,18 /.
2- . M2 =126,2, m2 =2,04. .. 126,29 2 * 2,04 = 126,2 4,08 /. =126,29+4,08 =126,29-4,08. 2- 122,21 130,37 /.
2- , 95% , 1- 118,62 125,18 /, 2- - 122,21 130,37 /. 1- 2- , , .
) , 1‑ 2- .
:,
: M1 1- - 121,8,
M2 2- - 126,2,
m1 1- - 1,64,
m2 2- - 2,04.
Excel :
=(121,8 126,2)/(1,64^2+2,04^2) = -1,64667.
=ABS() = ABS(-1,64667) = 1,64667. =(; ) = (1,64667;2) = 1,65)
t - (-1,65) (1,65) , n >30 2. n <30 df = n1 + n2 2 = 16 + 17 2 = 31. Excel = ( p; df) =
|
|
= (0,05;(16+17-2)) = 2,04.
t >2,04 p<0,05 , , . t <2,04 .
: t = 1,65 < 2,04.
(n 1= n 2), Excel =(1;2;2;3), :
1 - ( );
2 - ( ).
2- , . , , .
16- . 0,12. , 12%. (p =0,05 5%), , , . , , .
: 1- 2- . , 2- (126,2 /) 1- (121,9 /) p =0,05.