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b
where i is absolute value of any coefficient of
regression ;
S
b b
i — root mean square deviation i (error of
coefficients of regression);
t
T — table-valued Student's criterion, which is
determined according to number of degrees of freedom N∙(m-
1)=f o and level of significance q (Table 4.2).
The second way to examine significance of coefficients of
regression is to use a confidence interval Δb i, which is the same
for all b i because of equality of all S bi.
Table 4.2 - Values of Student’s criterion
f о/q 0,10 0,05 0,02 0,01 0,002 0,001
1 6,31 12,7 31,82 63,7 318,3 637,0
2 2,92 4,30 6,97 9,92 22,33 31,6
3 2,35 3,18 4,54 5,84 10,22 12,9
4 2,13 2,78 3,75 4,60 7,17 8,61
5 2,01 2,57 3,37 4,03 5,89 6,86
6 1,94 2,45 3,14 3,71 5,21 5,96

7 1,89 2,36 3,00 3,50 4,79 5,40
8 1,86 2,31 2,90 3,36 4,50 5,04
9 1,83 2,26 2,82 3,25 4,30 4,78
10 1,81 2,23 2,76 3,17 4,14 4,59
11 1,80 2,20 2,72 3,11 4,03 4,44
12 1,78 2,18 2,68 3,05 3,93 4,32
13 1,77 2,16 2,65 3,01 3,85 4,22
14 1,76 2,14 2,62 2,98 3,79 4,14
15 1,75 2,13 2,6 2,95 3,73 4,07

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