欢迎来到牛牛题库网 牛牛题库官网
logo
搜索

问答题

简单随机重复抽样中，若抽样单位数增加3倍，则抽样平均误差如何变化?若抽样允许误差扩大为原来的2倍，则抽样单位数如何变化?若抽样允许误差缩小为原来的1／2倍时，抽样单位数如何变化?

【参考答案】

\n \n \n
（1）抽样平均误差为原来的1／2
（2）......

(↓↓↓ 点击下方‘点击查看答案’看完整答案 ↓↓↓)

点击查看答案

相关考题

未知题型
下面程序运行输出的结果是【 】。
include ＜iostream＞
using namespace std;
int main(){
char a[]='Chinese';
单项选择题
PLC一般都采用模块式结构（ ）
A、正确
B、错误
未知题型
In a country plagued by skyrocketing sick-leave costs, a new survey presented Friday found that 40% of Sweden’s population believes 【B1】______ .
The survey, by the National Social Insurance Board, also found that 65% of the 1,002 people interviewed think a stressful work situation is also a valid reason for calling in sick and collecting pay under Sweden' s liberal social programs.
The survey shows 'a deep lack of knowledge about what the health insurance is meant to cover,' board director Anna Hedborg said of Sweden's 9 million residents.
Alf Eckerhall, a social insurance expert with the Confederation of Swedish Enterprise, went a step further: 【B2】______ .
'The insurance laws clearly state that inability to work because of illness' is the only valid reason to stay home, Eckerhall saiD.' 【B3】______ .'
The survey, conducted June 17-24, did not have a margin of error.
Sweden' s extensive cradle-to-grave welfare system includes generous programs covering sick leave, parental leave and unemployment benefits. But paying for workers on long-term sick leave and disability has become one of the government's biggest expenditures. 【B4】______ .
In Sweden, the employer pays for the first three weeks' sick leave, and workers can call in sick for seven days before needing a doctor's certificate or medical prooF.
People who call in sick do not receive any compensation for the first day they are absent. But Eckerhall said many people get around that by leaving work a little early, and then calling in sick for that day. That counts as one sick day, 【B5】______ . 'That means your day without compensation was 15 minutes long,' Eckerhall saiD.Hedborg said the board will launch a massive nationwide campaign to inform. people that illness is the only valid reason to stay home from work.
'To many, this message may seem hard and even insensitive,' she wrotE.'The truth is, that if we don't defend our common insurance today, we won't be able to afford keeping it.
A.many Swedes deliberately abuse the system
B.as the survey believed that the system is out of order
C.the key word is 'inability to work'-not illness
D.which lets them start receiving sick pay the next day
E.parental leave compensation doubled from $ 2 billion to $ 4 billion
F.these Swedes just don't want to work
G. sick leave compensation tripled from $ 2 billion in 1997 to $ 6 billion in 2002
H. it is acceptable to skip work because they feel tired or have trouble getting along with colleagues
【B1】______
微信小程序免费搜题

All Rights Reserved 版权所有©牛牛题库网(nntiku.com)

备案号：湘ICP备2022003000号-1

微信扫一扫,加关注免费搜题

微信扫一扫,加关注免费搜题