要研究四种不同血型的人糖尿病的患病率是否不同,采用多个率比较的卡方检验,构建一个4行2列的R*C表后,其卡方值的自由度为()
A.8
B.1
C.3
D.跟样本含量有关
参考答案:C
The boy was at the terrible story, which was written for adults.
A.scary
B.scaring
C.scared
D.scared
一个7岁小孩平时生活上戴+3.00眼镜此人属()
A、正视眼
B、远视眼
C、近视眼