【简答题】According to the passage, why does the cancer increase? [A] Because people expose too much to the computer. [B] Because people don't care about the low levels of radiation. [C] Because the cells are k...
【单选题】According to the text, why does the same deafness afflict the same people?
A.
Because governments all turned their attention to these people.
B.
Because these people are more likely to have unhealthy behaviors.
C.
Because these people suffer more from their poor income and education.
D.
Because governments always neglect the real needs of these people.
【单选题】Why does the author say that Swiss people may not be able to tell the name of their president?
A.
Because Swiss people are indifferent to politics.
B.
Because Swiss people are inaccessible to political information.
C.
Because the election of Swiss president has nothing to do with the Swiss.
D.
Because president of Switzerland is not directly elected by the Swiss.
【单选题】下列说法错误的是 [ ]
C.
在频数分布直方图中,小长方形的面积是该组的频率
D.
用样本估计总体时,样本容量越大对总体的估计就越精确
【单选题】下列有关频数分布表和频数分布直方图的理解,正确的是( )
C.
频数分布直方图能清楚地表示出各部分在总体中所占的百分比
D.
二者均不能清楚地反映变化情况和在总体中所占的百分比,但能反映出每个项目的具体数目
【单选题】下列说法不正确的是( )
C.
在频数分布直方图中,小长方形的面积是该组的频率
D.
用样本来估计总体,样本越大对总体的估计就越精确