青云翻译

Therefore, we used another survey: sample survey. Sample survey is the survey data was randomly selected to form a sample of some of the data, through analysis of the data sample to estimate the situation of all data. What I sent flyers to every student of statistics

We used another survey: sample survey. In the data sample is surveyed to extract some data to form a random sample, through the analysis of sample data to estimate data of the whole of the situation. We sent leaflets to every student statistics

Therefore we use are another kind investigate: Sample investigation.The sample investigation is in the data which investigates is extracted some data to compose stochastically a sample, through the data analysis estimates all data to the sample in the situation.I send the circular for each schoolmat

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We used another survey: sample survey. In the data sample is surveyed to extract some data to form a random sample, through the analysis of sample data to estimate data of the whole of the situation. We sent leaflets to every student statistics