A.可以小于0 | B.只能大于0 | C.可以为0 | D.只能小于0 |
0.25 | 0.15 | 0.10 | 0.05 | 0.025 | 0.010 | 0.005 | 0.001 | |
1.323 | 2.072 | 2.706 | 3.841 | 5.024 | 6.635 | 7.879 | 10.828 |
x | 2 | 3 | 4 | 5 | 6 |
y | 2.2 | 3.8 | 5.5 | 6.5 | 7. 0 |
月份 | 1 | 2 | 3 | 4 |
用水量 | 4.5 | 4 | 3 | 2.5 |
x | 0 | 1 | 2 | 3 |
y | 1 | 3 | 5 | 7 |
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