【多选题】【消耗次数：1】
区间估计必须具备的要素是（ ）。
①
点估计值
②
置信区间
③
置信度
④
概率
⑤
抽样平均误差
参考答案：
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相关题目
【单选题】
对总体的均值做区间估计，得到置信度为95%的置信区间，意义是指这个区间（）
①
平均含总体95%的值
②
平均含样本95%的值
③
有95%的机会含的值
④
有95%的机会含样本的值
【单选题】
以样本比率为估计量构造总体比率的置信区间，下述说法正确的是
①
.样本容量较小的置信区间较小
②
相同置信水平下，样本量大的区间较大
③
95%置信水平下的置信区间比90%置信水平的置信区间宽
④
样本均值越小，区间越大
【多选题】
下列关于总体均数的95%置信区间的说法中有误的是（ ）
①
估计总体中有95%的观察值在此范围内
②
总体均数在该区间的概率为95%
③
样本中有95%的观察值在此范围内
④
该区间包含总体均数，可信度为95%
⑤
该区间包含总体均数的可能性为95%
随机题目
【单选题】
3.Iveread_______sportsnewsabouttheF1racetoday.
①
two
②
pieces
③
two pieces
④
two pieces of
【填空题】
Direction: Fill in the blanks with the wordsor phrasesgiven below. Change the form if necessary.[tender; suffer; in anxiety; crave; choke; plague; with a sigh; dull; nonsense; threshold]6. He was carried away by the[填空1].
【填空题】
Direction: Fill in the blanks with the phrases given below. Change the form if necessary.[have access to; go off; desperate for; put up with; always the case; give advice; concentrate on; arrive at; make an effort; come in handy]5.Ill have to[填空1]the noise till I move next week.
【填空题】
Direction: Fill in the blanks with the words given below. Change the form if necessary.[hug; flatten; ancestor; amazing; solemnly; comfort; awful; desperately; uproot; cousin]9. The government were to[填空1]all its troops from the region.
【填空题】
Direction: Fill in the blanks with thephrases given below. Change the form if necessary.[ought to; look forward to; in wonder; give way to; look down; on the way to; reach out; put one’s arm around; trip over; cut into]4. If you dont lace up your shoes, youll[填空1].
【简答题】
Translate the following sentences into Chinese.The engineers hope that the latest data will be of great use to the problem in our jobs.
【简答题】
Translate the following sentence into Chinese.These senior scientists have committed to the rapid development of the Air Force of China all their lives.
【简答题】
Translate the following sentence into English.无论我作出什么样的牺牲，我都要从事这项事业。
【填空题】
计算机启动通常有[填空1][填空2]、热启动和系统复位三种方式。