皮皮学，免费搜题
登录
搜题
【单选题】
以下关于直线相关关系的说法错误的是A.
直线相关关系存在，说明两变量间存在因果联系
B.
样本相关系数与总体相关系数之间的差别是抽样误差造成的
C.
在用散点图反映两变量间的直线相关关系时，可任意选其一作横标目，另一为纵标目
D.
要求分析的两个变量均应满足或近似满足正态分布
E.
直线相关关系是否有统计学意义，必须经过统计学假设检验来判断
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Britain almost more than any other country in the world most seriously faces the problem of building upwards, that is to say, of accommodating a considerable proportion of its population in high block...
A.
English people like most people in other countries, dislike living in flats
B.
people in most countries of the world today are not opposed to living in flats
C.
people in Britain are forced to move into high blocks of flats
D.
modem flats still fail to provide the necessary facilities for living
【单选题】People in Britain are living longer and are 【56】,【57】 more and more money is being spent on consumer goods,【58】 the latest statistics. But while people 【59】appear to be healthier and wealthier, an ana...
A.
looked after
B.
cared for
C.
better off
D.
out of control
【简答题】链球菌引起猩红热的主要毒性物质是_________。
【单选题】Fish and chips ______ getting more and more expensive in many places of Britain.
A.
are
B.
are to
C.
is
D.
is to
【单选题】用三爪卡盘夹持轴类零件,车削加工内孔出现锥度,其原因可能是( )。
A.
A 夹紧力太大，工件变形
B.
2951 2 B 刀具已经磨损 0
C.
C 工件没有找正
D.
D 切削用量不当
【简答题】引起猩红热的主要毒性物质是 。
相关题目：