He doesn't know which book he should choose.(同上)He doesn't know which book_1_2.

题干

He doesn't know which book he should choose.(同上)

He doesn't know which book____ ____.

上一题下一题 0.0难度选择题更新时间:2018-05-19 11:06:29

答案(点此获取答案解析）

to,choose

同类题5

	男	女	总计
爱好	40	20	60
不爱好	20	30	50
总计	60	50	110

由 $k^{2} = \frac{n {(a d - b c)}^{2}}{(a + b) (c + d) (a + c) (b + d)}$ 算得， $k^{2} = \frac{110 \times {(40 \times 30 - 20 \times 20)}^{2}}{60 \times 50 \times 60 \times 50} \approx 7.8$ ．

P（K²≥k）	0.050	0.010	0.001
k	3.841	6.635	10.828

参照附表，得到的正确结论是（）

题干

答案(点此获取答案解析）

同类题1

同类题2

同类题3

同类题4

同类题5