Can simple random sampling be put back?

Simple random sampling is also called simple random sampling. It should be put back! As a sampling method, it selects samples from the matrix by purely accidental method without any grouping, queuing, etc. In the whole unit, any subjective and purposeful choice is completely ruled out. This method can better reflect that the opportunity of each offspring in the group is completely equal, and the selected sample is close to the characteristics of the group, which is a relatively simple and easy method in various probability sampling. In order to realize the randomization of sampling, methods such as drawing lots and looking up a random number table can be adopted. The advantage of this method is that the sampling error is small, and the disadvantage is that the sampling procedure is complex. In practical work, it is not easy to really let every individual in the group have exactly the same chance of being drawn. The random number table is a combination of numbers randomly arranged by the computer, which is irregular. The appearance of these numbers is completely equal probability. The random number table consists of random numbers generated by statisticians with computers, which ensures that which number appears in each position in the table is of equal probability. Using a random number table to extract samples can ensure that the probability of each individual being extracted is equal. As a bank, its ID and password are also very fragile. If you have a random number table, you can guard against such incidents. The random number table refers to the list of different numbers assigned to each customer, and the random number table assigned to customers at the time of application. If the passwords we usually use are randomly assigned by the computer instead of given according to certain rules, you will feel unsafe, so you will hear that many people will go to the random number table generator.