305
14.8-jadval
Normal chiziqli tenglamalar tizimining koeffitsiyentlarini hisoblash
T/r
Oila a’zolarining
o‘rtacha bir oylik
daromad, ming
so‘m (X)
Bir sutkada har bir
oila a’zosi
tomonidan iste’mol
qiladigan yog‘, gr
(U)
X
2
XU
Ux=22,55+
0,017x
(gr)
1.
29,0
15,2
841,0
440,8
16,02
2.
38,0
17,0
1444,0
646,0
19,77
3.
46,0
25,0
2116,0
1150,0
23,11
4.
54,0
26,3
2916,0
1420,2
26,44
5.
62,0
32,0
3844,0
1984,0
29,78
6.
70,0
34,1
4900,0
2387,0
33,11
7.
79,0
38,0
6241,0
3002,0
36,87
8.
97,0
42,0
9467,29
4086,6
44,50
∑
475,3
229,6
31769,29
15116,5
229,6
Normal tenglamalar tizimiga jadvaldagi ma’lumotlarni qo‘yib chiqamiz:
8a
0
+ 475,3a
1
= 229,6;
475,3a
0
+31769,29 a
1
= 15116,6.
Har bir tenglamaning hadlarini a
0
koeffitsiyentining oldidagi 8 soniga bo‘lib
chiqamiz:
a
0
+ 59,412a
1
= 28,7;
a
0
+66,84a
1
= 31,8.
Ikkinchi tenglamadan birinchisini ayirib chiqsak, u holda:
2,428€
1
= 3,1. Bu yerda €
1
=
3,1
7,428
= 0,417
a
1
qiymatini birinchi tenglamaga qo‘yib, a
0
ning qiymatini aniqlaymiz:
a
0
+ 59,412x
0
417 = 28,7;
bu yerda
a
0
=28,7 – 24,755=3,925.
Tenglamadagi a
0
va a
1
parametrlarni quyidagicha ham hisoblash mumkin:
a
0
=
229,6 + 31769,29 − 15116,6 ∗ 475,3
8 ∗ 31769,29 − 475,3 ∗ 475,3
= 3,925;
a
0
=
8 ∗ 15116,6 − 229,6 ∗ 475,3
8 ∗ 31769,29 − 475,3 ∗ 475,3
= 0,417.
Shunday qilib, korrelyatsion bog‘lanish regressiyasining to‘g‘ri chiziqli
tenglamasi quyidagi ko‘rinishni oladi:
306
U
x
= 3,925 + 0,417 X
Ushbu tenglama yordamida U ning qatordagi istalgan qiymatini aniqlash
mumkin. Masalan,
U
x
= 3,925 + 0,41729,0 =16,02
U
x
= 3,925 + 0,417 38,0 =19,77
U
x
= 3,925 + 0,417 46,0 =23,11
U
x
= 3,925 + 0,417 54,0 =26,44
U
x
= 3,925 + 0,417 62,0 =29,78
U
x
= 3,925 + 0,417 70,0 =33,11
U
x
= 3,925 + 0,41779,0 =36,87
U
x
= 3,925 + 0,417 97,3 =44,50
Bu yerda a
1
regressiya koeffitsiyenti natijaviy belgi (U) bilan omil belgi (x)
o‘rtasidagi bog‘lanishni belgilab beradi. Bu esa omil belgi bir birlikka ortganda
natijaviy belgi necha birlikka oshadi, degan savolga javob beradi.
Bizning misolimizda a
1
≈ 0,42 ga teng. Demak daromadning bir songa oshishi
har bir oila a’zosi tomonida iste’mol qilinadigan yog‘ning bir sutkada 0,42 grammga
oshishiga olib keladi. Boshlangich ma’lumotlar (X
i
, U
i
) dekart kordinata tizimiga
qo‘yib chiqilsa, korrelyatsiya maydoni hosil bo‘ladi. Bu quyidagi chizmada aks
ettirilgan (14.1-rasm).
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