皮皮学，免费搜题
登录
搜题
【单选题】
样本平均数是总体平均数的无偏估计,如,从水稻种植小区A中随机抽取1000穗稻穗,统计每穗稻粒数的平均值为89粒用以估计水稻每穗粒数。试问该抽样中,样本是指( ),总体是指( )。A.
1000穗稻穗的平均值、小区A中所有稻穗的平均数
B.
1000穗稻穗、小区A中的所有稻穗
C.
1000穗稻穗、全部试验地块的所有稻穗
D.
样本平均数、总体平均数
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
【简答题】Mr. and Mrs. Harris had always spent their summer holidays in a small hotel at the seaside near their hometown. One year, however(然而) , Mr. Harris made a lot of 1 in his business, 2 they decided to go...
【简答题】Like many high school graduates, Maggie Doyne didn’t go straight to college. She decided to travel and arrived in western Nepal in 2006. A war had just ended there and left many children living on the...
【简答题】练习 1 :分辨下列句中不定式的句能。 1. My wish was to become a scientist . 2. She decided to resign . 3. They felt it impossible to finish the work in just two days . 4. To lie on this beach is comfortable. 5. This...
【简答题】Mr. and Mrs. Harris had always spent their summer holidays in a small hotel at the seaside near their hometown. One year, however(然而) , Mr. Harris made a lot of 1 in his business, 2 they decided to go...
【简答题】冬天某人进入浴室后不久便突然晕倒，其血流动力学的原始因素是（ ）
【简答题】Listen to the conversation again and filling in the blanks according to what you heard. It was sunny for at least two days in this week. The employees from the Recourse Department were going to mow th...
【简答题】电阻等于零时,电路处于()状态。
【简答题】用所给词的适当形式填空。 1. Two hours is a long time _____ (stay) still. 2. They decided _____ (go) to the cinema. 3. I have something nice _____ (eat). 4. _____ (watch) the football match, I can go to the stadiu...
相关题目：