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What statistics are used to prove that the performance improvement of the two groups of personnel before and after training is obvious?
Drawing statistical graph of broken line with Excel.

The trend of data change can be clearly seen in the broken-line statistical chart, which is most suitable for some changes such as temperature and weather. The broken-line statistical chart can clearly reflect the changes of things.

A statistical chart that shows the increase or decrease of statistics by the rise or fall of broken lines is called a broken line statistical chart. The statistical graph of broken lines shows the increase and decrease of data with the fluctuation of broken lines. It can not only represent quantity, but also reflect the change of data.