简单随机样本无须满足各个个体的选择是独立的条件_爱下问搜题

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问题判断题

简单随机样本无须满足各个个体的选择是独立的条件

答案

参考答案：错

补全对话，情景问答

给下列问句选择答语。

( ) 1. How are you?
( ) 2. Can you say it?
( ) 3. What's her name?
( ) 4. What's this?
( ) 5. What's your name?

a. It's a book.
b. Yes, I can.
c. My name is Jenny.
d. Fine, thanks.
e. Her name is Kim.

选择题

(2011·宁波模拟)起重机以1 m/s2的加速度将质量为1 000 kg的货物由静止开始匀加速向上提升，若g取10 m/s2，则在1 s内起重机对货物所做的功是( )

A．500 J

B．4 500 J

C．5 000 J

D．5 500 J