3 (, 3 ), st.dev.
, , st.dev.
2 ( ), ().
. st.dev?
st.dev ?
 
| |
petr, 26.05.2010 16:17
( 2% SDS, HNO3 atomic absorbtion). , , . , .. .
3 (, 3 ), st.dev.
, , st.dev.
2 ( ), ().
. st.dev?
st.dev ?
3 (, 3 ), st.dev.
, , st.dev.
2 ( ), ().
. st.dev?
st.dev ?
petr, 26.05.2010 16:21
, , , - , ..
petr, 26.05.2010 16:22
.. , , . ?
Yuri K, 26.05.2010 16:28
(petr @ 26.05.2010 16:22)
.. , , . ?:
CV^2=CV1^2+CV2^2
"The law of error propagation"
Yuri K, 26.05.2010 16:58
1 , , , . precision , .
, , , .
, , , .
Statin, 26.05.2010 17:40
, , . . .
petr, 26.05.2010 18:00
(Yuri K @ 26.05.2010 14:28)
:CV^2=CV1^2+CV2^2
"The law of error propagation"
, Excele, .
, :
a 64.8537 / d 93.3367 / 0.694836008 a/d
b 64.703 / e 92.7339 / 0.699352664 a/e
c 62.2918 0.693221423 b/d
1.437586377 std1 / 0.426243968 std2 / 0.697727584 b/e
0.667388069 c/d
0.671726305 c/e
0.014034577 std NORM
2.06665459 std1^2 0.18168392 std2^2 2.24833851 1.499446068
Std1^2+std2^2= 2.24833851
std norm (2.24833851)^0.5=1.499446068
std NORM 0.014034577
!
petr, 26.05.2010 18:01
, , .
Neznika, 26.05.2010 18:14
(petr @ 26.05.2010 19:01)
, , .,
petr, 26.05.2010 18:17
(Neznika @ 26.05.2010 16:14)
, 64.8537
64.703
62.2918
93.3367
92.7339
Yuri K, 26.05.2010 18:20
( ), :-) :
Mean 1=995 Std 1= 48
Mean 2=38 Std=3
Mean 1/Mean 2=26.2
CV1=48/995=0.048 CV2=3/38=0.079
CV ( )=Sqrt(CV1^2+CV2^2)=Sqrt(0.0023+0.0062)=Sqrt(0.0085)=0.092
Std=26.2*0.092=2.4
. .
Mean 1=995 Std 1= 48
Mean 2=38 Std=3
Mean 1/Mean 2=26.2
CV1=48/995=0.048 CV2=3/38=0.079
CV ( )=Sqrt(CV1^2+CV2^2)=Sqrt(0.0023+0.0062)=Sqrt(0.0085)=0.092
Std=26.2*0.092=2.4
. .
petr, 26.05.2010 18:50
,
Neznika, 26.05.2010 19:43
, ?
Yuri K, 27.05.2010 16:16
.
Neznika, 27.05.2010 20:21
, -
_.pdfguest: sdg7 , 19.09.2012 11:33
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