1. Remember, all forms of probability sampling involve random sampling at some stage in the selection process.

2. Fixed probability sampling is the simplest technique for detecting bigger traffic flows while discarding the smaller ones which consist almost more than 80% of the count of whole traffic flows.

3. The antidotes for solving these problems in our country's public opinion survey report are the folio wings. Firstly, probability sampling should become main sampling method in public opinion survey.

4. Line intersect sampling is survey method of rare population and unequal probability sampling with replacement. It based on Buffon's needle problem and had a perfect theory basis.

5. The antidotes for solving these problems in our country's public opinion survey report are the followings. Firstly, probability sampling should become main sampling method in public opinion survey.

6. The result showed that the root-mean-square of Phase function fitted by random probability sampling method is smaller.

7. Methods According to the distribution of recreation places of Shunqing district, 368 CSW were investigated one-to-one by anonymous questionnaire through equal probability sampling.