皮皮学，免费搜题
登录
搜题
【单选题】
随机抽取一个样本容量为100的样本,计算得到样本均值为60,样本标准差为15,要检验H0:μ=65,H1:μ≠65,检验统计量为A.
-3.33
B.
3.33
C.
-2.36
D.
2.36
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】为了使类中的某个成员不能被类的对象通过成员操作符访问,则不能把该成员的访问权限定义为
A.
private
B.
public
C.
protected
D.
const
【单选题】—How often do I need to feed the birds? —They _______ food every day, or they will be hungry. [ ]
A.
must give
B.
mustn't give
C.
must be given
D.
mustn't be given
【单选题】According to Lily, why do supermarkets often discount food after 4 p.m.?
A.
The food doesn’t sell well.
B.
The food is going to expire.
C.
They want to help customers in need.
D.
They want to introduce new products.
相关题目：