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x=6+7+8+94 =
15
2,y=
118+126+136+144
4 =131,%1tumOK6
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2.5+t+4+4.5
4 =
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11+t
4 =0.7×4.5+0.35,23t=3,(C)��;
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y=bx+
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30+40+60+p+70
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p=50.
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a=100,b=20,c=60,d=20
vw χ2 =
n(ad-bc)2
(a+b)(c+d)(a+c)(b+d)s3 χ
2 =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 -
5x
6 ×
x( )3
2
x× x2 ×
x
2 ×x
=3x8 >6.635,"#
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!
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# $
%!"&' %!"()* +,
%#$&'
80 40 120
%#$()*
70 10 80
+,
150 50 200
(2)χ2 =200×(80×10-40×70)
2
150×50×120×80 =
100
9 ≈11.111>
6.635,
$B.
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9:FGH<=FG
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13.
!
:(1)x=90+85+74+68+635 =76,
y=130+125+110+95+905 =110,
b=
5
i=1
xiyi-5xy
5
i=1
x2i-5x
-2
=42595-5×76×110
29394-5×762
=795514≈1.5,
a=y-bx=110-1.5×76=-4,
()IJKLMN%
y=1.5x-4.
(2)
O
x=80
P
,y=1.5×80-4=116.
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80
Z
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116
Z
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14.
!
:(1)
_
2×2
?@A3>'1`abcde#
:
χ2 = n(ad-bc)
2
(a+b)(c+d)(a+c)(b+d)
=100(60×