phÉp kiỂm f...2.8962 2.7964 2.7144 26458 23876 2.5377 24943 2.4563 24227 2.3928 2.3660 2.3419...
TRANSCRIPT
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PHÉP KIỂM F
Phân tích phương sai
TS NGUYỄN NGỌC RẠNG
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R A Fischer 1890- 1962
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PHÂN PHỐI F
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PHÉP KIỂM F
Nếu phương sai 3 phân phối gần bằng nhauSo sánh 3 trung bình: m1,m2, m3
m1 m 2 m3
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PHÉP KIỂM F
m1 m 2 m3
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SD (n1=10) SXH (n2=10) NSV (n3=10)
150 100 140
140 130 200
170 80 210
160 70 230
90 40 100
240 30 120
100 120 220
100 130 160
120 20 150
90 80 170
m1=140 m2=80 m3=170
Trung bình 3 nhóm:m= 130
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Phép kiểm F
Phương sai giữa 3 nhóm: 10 (m1-m)2+ 10 (m2-m) 2+10 (m3-m)2
10 (140-130)2+ 10 (80-130) 2+10 (170-130)2 = 42000
Phương sai toàn bộ mẫu:(150-140)2+ (140-140)2+….. (100-80)2+(130-80)2+…(140-170)2+ (200-170)2= 50660
F= Phương sai nhóm/ bậc tự do nhómPhương sai mẫu/ bậc tự do mẫu
F= 42000/2 = 11,2 tra bảng với DF (2,27)50600/27
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Ứng dụng trong SPSS
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Ứng dụng trong SPSS
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Ứng dụng trong SPSS
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Ứng dụng trong SPSS
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Ứng dụng trong SPSS
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Bảng phân phối F
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