Survey sampling

$\bullet$∙What is survey sampling?(c.f.census survey)(c.f.:参考，查看，来源于拉丁语)
$\bullet$∙understanding the whole by a $\underline{fraction}$fraction​(i.e.a $\underline{sample}$sample​)
Population:
Q:What is the population to survey?(In some cases,it can be difficult to identify or determine)
N:population size
a sample of size n:a subgroup of n members(n<N)
Q:Which n members should be included in the sample?(i.e.how to produce a $\underline{representative}$representative​ sample)
$x_i,i=1,2,3\cdots N$xi​,i=1,2,3⋯N

$\underline{Definition : }$Definition:​(survey sampling)
A technique to obtain $\underline{information}$information​ about a $\underline{large}$large​ population by examining only

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