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x=6+7+8+9
4
= 15
2
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4
=131,
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x=5,y=0.9,
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7.9,
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23
p=50.
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x=4,y=5.1,
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a=100,b=20,c=60,d=20
v w χ2 =
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(a+b)(c+d)(a+c)(b+d)
s3 χ2 =
200(2000-1200)2
160×40×120×80
≈2.1,7²2.1.
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χ2 >6.635,
! χ2 =
3x
2
x
6
× x
6
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6
× x( )3
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× x
2
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=3x
8
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12.
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80 40 120
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70 10 80
+,
150 50 200
(2)χ2 =
200×(80×10-40×70)2
150×50×120×80
=100
9
≈11.111>
6.635,
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9:FGH<=FG
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13.
!
:(1)x=90+85+74+68+63
5
=76,
y=130+125+110+95+90
5
=110,
b=
5
i=1
xiyi-5xy
5
i=1
x2i-5x
-2
=42595-5×76×110
29394-5×762
=795
514
≈1.5,
a=y-bx=110-1.5×76=-4,
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y=1.5x-4.
(2)
O
x=80
P
,y=1.5×80-4=116.
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116
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14.
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2×2
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