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【简答题】
某快餐店想要估计每位顾客午餐的平均花费,在为期 3 的时间里选取 49 位顾客组成了一个简单随机样本。 ( 1 )假定总体标准差为 15 元,求样本均值的标准误差。 ( 2 )在 95% 的置信水平下,求估计误差。 ( 3 )如果样本均值为 120 元,求总体均值 的 95% 的置信区间。
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举一反三
【简答题】有int x,y,z;且x=3,y=-4,z=5,则表达式 !(x>y)+y!=z)||(x+y)&&(y-z)的值为
【简答题】血浆晶体渗透压和血浆胶体渗透压的生理意义分别是什么?
【简答题】有 int x,y,z ;且 x=3,y= -4,z=5 ,则以下表达式的值为 。 !(x>y)+(y!=z)||(x+y)&&(y-z)
【单选题】Issuing debt instead of new equity in a closely held firm is most apt to cause
A.
agency costs to fall as owner-managers do not need to worry about other shareholders
B.
the owner-manager to work less hard and shirk duties
C.
the owner-manager to reduce shirking and perquisite consumption
D.
both more shirking and perquisite consumption since the government provides a tax shield on debt
【判断题】If the ownership of the companies is not open to the public, we call them closely held companies.
A.
正确
B.
错误
【判断题】If the ownership of the companies is not open to the public, we call them closely held companies.
A.
正确
B.
错误
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