A.(2, 2) | B.(1, 2) | C.(1.5, 0) | D.(1.5 , 5) |
1 | 1 | -0.8 |
0.1 | -0.3 | -1 |
1 | 1 | c |
a | b | -1 |
A.10 | B.9 | C.8 | D.7 |
A. | B. |
C. | D. |
疱疹面积 | ||||
频数 | 30 | 40 | 20 | 10 |
频率/组距 | | | | |
疱疹面积 | |||||
频数 | 10 | 25 | 20 | 30 | 15 |
频率/组距 | | | | | |
| 疱疹面积小于70 | 疱疹面积不小于70 | 合计 |
注射药物A | a= | b= | |
注射药物B | c= | d= | |
合计 | | | n= |
P(K2≥k) | 0.10 | 0.05 | 0.025 | 0.010 | 0.001 |
k | 2.706 | 3.841 | 5.024 | 6.635 | 10.828 |
| 爱看课外书 | 不爱看课外书 | 总计 |
作文水平好 | | | |
作文水平一般 | | | |
总计 | | | |
0.10 | 0.05 | 0.025 | 0.010 | 0.005 | 0.001 | |
2.706 | 3.841 | 5.024 | 6.635 | 7.879 | 10.828 |
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