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conditions of Task 4.1 and 4.3
Solving:
Variance of coefficients of equation of regression is
determined by the formula (4.13):
 4
2 11 , 945  10  5
S   , 9 95  10
b i
4  3
Determining root mean square deviation:
2  3
S  S  9 , 97  10 ,
b i b i
Estimated value of Student's criterion is determined by
the formula (4.14):
0 , 481
t op   48 , 24
9 , 97  10  3

0 , 096
t   9 , 62
1 p  3
9 , 97  10
0 , 242
t   24 , 27
2 p  3
9 , 97  10
Tabular values of Student's criterion at degree of freedom
f o = 4∙(4-1) = 12 and significance level q = 0.05 is determined
t
from Table 4.2: Т = 2.18.
All coefficients of equation of regression are significant
t t 
because ip Т .
The second way is to compare absolute values of
coefficients b i with the value of the confidence interval Δb i.
Determining the confidence interval:
 b   S  , 9 97  10  3
i i b
So for:
-3
b o 0,481 > 9,97∙10 ;
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