X | 0 | 1 | 2 | 3 | 4 | 5 |
P | 2x | 3x | 7x | 2x | 3x | x |
患病 |
不患病 |
合计 |
|
吸烟 |
43 |
162 |
205 |
不吸烟 |
13 |
121 |
134 |
合计 |
56 |
283 |
339 |
能否99%把握认为患慢性气管炎是否与吸烟有关?
P(K2≥k) |
0.50 |
0.40 |
0.25 |
0.15 |
0.10 |
0.05 |
0.025 |
0.010 |
0.005 |
0.001 |
k |
0.455 |
0.708 |
1.323 |
2.072 |
2.706 |
3.841 |
5.024 |
6.635 |
7.879 |
10.828 |