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分层抽样的依据The survey employed a three-
分层抽样的依据The survey employed a three-stage stratified sample, 在第一层中，上海市的urban area, suburban area and peripheral area被分成了 A，B，C三个districts。但是作者仅因为B区的人数较多，而只在B区选择了4所学校进行调查（District A 和 District A分别两所），这可能会影响整个实验的结果。B区人数是多少？是A区和C区人数的两倍吗？A区和C区学生人口数量是否一样？这种实验方法表明并没有对每个地区进行不同的调查，这可能导致某一地区的数据会弱化或者加强整个上海市的数据。
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The basis of stratified sampling <br>The survey employed a three-stage stratified sample. In the first layer, Shanghai's urban area, suburban area and peripheral area are divided into three districts, A, B, and C. However, the author only selected 4 schools in District B for investigation (District A and District A respectively) because of the large number of people in District B, which may affect the results of the entire experiment. What is the number of people in Zone B? Is it twice the number of people in Zone A and Zone C? Is the number of students in Zone A and C the same? This experimental method shows that there is no different survey for each region, which may lead to weakening of data in a certain region or strengthening of data in Shanghai as a whole.
正在翻译中..
The basis for stratified sampling<br>The survey employed a three-stage stratified sample, in the first floor, Shanghai's urban area, the suburban and pertoun area is divided into A, B, C three districts. However, the authors chose only four schools in Area B (District A and District A, respectively) because of the large number of people in Area B, which may affect the results of the entire experiment. What is the number of people in Zone B? Is it twice the number of people in Areas A and C? Is the number of students in Districts A and C the same? This experimental method shows that no different surveys have been conducted on each region, which may lead to a weakening of data in a particular region or the strengthening of data across Shanghai.
正在翻译中..
The basis of stratified sampling<br>The survey employed a three-stage structured sample, in the first layer, the urban area, the suburban area and the peripheral area of Shanghai are divided into three districts, namely, a, B and C. However, the author only selected four schools in District B (district a and district a respectively) because of the large number of students in District B, which may affect the results of the whole experiment. What's the number of people in area B? Is it twice the number of people in area a and area C? Is the student population of area a and area C the same? This experimental method shows that there is no different survey for each region, which may lead to the weakening or strengthening of the data of a certain region in Shanghai.<br>
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