7.
某仪器配件质量采用M值进行衡量.某研究所采用不同工艺,开发甲、乙两条生产线生产该配件.为调查两条生产线的生产质量,检验员每隔30min分别从两条生产线上随机抽取一个配件,测量并记录其M值.下面是甲、乙两条生产线各抽取的30个配件的M值.
甲生产线:
25.1125.3225.3625.4125.3425.4025.3825.3725.4225.39
25.3925.4325.3925.4025.4425.4425.4225.3525.4125.43
25.4325.3525.4525.3925.3625.3425.9825.4525.3825.42
乙生产线:
25.5525.4325.4425.4525.4625.4725.7825.4625.3625.38
25.3325.5625.3925.2225.4325.3125.3725.3425.3225.46
25.4625.3325.0125.4325.4025.3525.3625.3825.2325.40
经计算得
![](https://www.ebk.net.cn/tikuimages/2/2019/700/shoutiniao73/7ef10c29565552764a5a74461785a064.png)
=
![](https://www.ebk.net.cn/tikuimages/2/2019/700/shoutiniao94/c9bebd5a13ae0e02e4b791b1ef2e6288.png)
![](https://www.ebk.net.cn/tikuimages/2/2019/700/shoutiniao48/11f849ffd6ef5db70e03bf5868173cad.png)
=25.405,s
甲=
![](https://www.ebk.net.cn/tikuimages/2/2019/700/shoutiniao55/90e599ba73999b99f0be764804e7ab68.png)
=0.123,
![](https://www.ebk.net.cn/tikuimages/2/2019/700/shoutiniao16/fe98a42059166427cd9e293d49dbf7fc.png)
=
![](https://www.ebk.net.cn/tikuimages/2/2019/700/shoutiniao50/b728cb4bf770cdbc4e5d461565776fab.png)
=25.395,s
乙=
![](https://www.ebk.net.cn/tikuimages/2/2019/700/shoutiniao94/08cf5c7fa25a4b4348502ff37d9109d8.png)
=0.125,其中x
i,y
i(i=1,2,……,30)
分别为甲、乙两生产线抽取的第i个配件的M值.
(1)若规定M∈(
![](https://www.ebk.net.cn/tikuimages/2/2019/700/shoutiniao25/3dedc533a7d2221ec7fb126cfe1a8f4d.png)
-3s,
![](https://www.ebk.net.cn/tikuimages/2/2019/700/shoutiniao25/3dedc533a7d2221ec7fb126cfe1a8f4d.png)
+3s)的产品质量等级为合格,否则为不合格.已知产品不合格率需低于5%,生产线才能通过验收.利用样本估计总体,分析甲、乙两条生产线是否可以通过验收;
(2)若规定M∈(
![](https://www.ebk.net.cn/tikuimages/2/2019/700/shoutiniao25/3dedc533a7d2221ec7fb126cfe1a8f4d.png)
-s,
![](https://www.ebk.net.cn/tikuimages/2/2019/700/shoutiniao25/3dedc533a7d2221ec7fb126cfe1a8f4d.png)
+s)时,配件质量等级为优等,否则为不优等.
①请统计上面提供的数据,完成下面的2×2列联表.
| 产品质量等级优等 | 产品质量等级不优等 | 小计 |
甲生产线 | | | |
乙生产线 | | | |
小计 | | | |
②根据上面的列联表,能否有90%以上的把握认为“配件质量等级与生产线有关”?
附:K
2=
![](https://www.ebk.net.cn/tikuimages/2/2019/700/shoutiniao78/e718f0e9506dff87d8cb5e864bde66f4.png)
,其中n=a+b+c+d.
P(K2≥k0) | 0.10 | 0.05 | 0.010 | 0.001 |
k0 | 2.706 | 3.841 | 6.635 | 10.828 |