How to understand "as long as the sampling method does not affect the results" in statistics?

Sampling survey methods can be divided into probability sampling and non-probability sampling.

Generally speaking, the property satisfaction survey of information consultation in the study room adopts probability sampling, and the influencing factors of sampling design are as follows:

1. Property service type: residence, office building, business, hotel, industrial park and public property. Before the sampling survey of information consultation in study room, it is necessary to know the types of customer property services and the number of customers.

2. The owner's staying time: As the owner stays in the residential project by stages, the experience of property services is slightly different. The information consultation of the upper study room is classified according to the owner's occupancy time, generally divided into prospective owners, running-in owners, stable owners and old owners, and sampled according to the number of various owners.

3. Satisfaction evaluation method: The property satisfaction survey of Shangshufang information consultation generally adopts telephone survey, household survey, in-depth interview and online questionnaire, and different evaluation methods will adopt different survey sampling methods.