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Editor Zhang Zhang shared some information about how to read random numbers with friends today. Let me explain to you how to read the random number table.

When we learn the knowledge of computational statistics, some friends will learn random number table method, that is, random number table method. When we use the random number table method to read, we can first determine our row and column names, then number them, and then record these numbers with random numbers. Let's see how Bian Shaw did it. I hope I can help you.

How to read the random number table method

The steps of the random number table method are as follows: first, the overall survey units are uniformly numbered and fully mixed, and then the sample unit numbers are selected from the random number table according to the prescribed sampling starting point and the prescribed sampling order.

1. Unified numbering: all the subjects in the whole population are numbered uniformly, and then fully mixed, so that the number of each sample is evenly distributed, in line with the principle of equal opportunity.

two。 Determine the sampling starting point: select a number on the table as needed or desired, which will determine the sampling starting point.

3. Determine the sampling order: according to the need or desire, select a sequence direction and extract it with this sequence direction.

4. Entry number: take the number in turn according to the sampling starting point and sampling order until the number of samples to be extracted is full.

Here is a concrete example:

For example, in order to investigate consumer demand for a product, enterprises should use the code table method to select 10 out of 95 households. The specific steps are as follows:

The first step is to number 95 households, one for each household, that is, 01-95. (2 persons per household)

In the second step, in the above table, the sampling starting point and sampling order are randomly determined. Suppose the sampling starts from the first row and the sixth column, and the sampling order is from left to right. (horizontal series are called rows and vertical series are called columns. So the sixth column here is the number 3.)

In the third step, the numbers are extracted in turn so that the unit digits of the 10 samples are: 37, 38, 63, 69, 64, 73, 66, 14, 69 and 16.

Households with these numbers are the subjects of a sample survey.

It should be noted that 69 households appeared twice in the sample. This is double sampling. The so-called repeated sampling is to take a unit in the group as a sample and then put it back into the group, which can be used as a sample for the second time.

Edit the information shared by Zhang Zhang on how to read the random number table. I hope it will be helpful to you.

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