The data analysis part of the test accounts for a relatively large number of questions, and the questions are relatively easy to grasp, so this part of the questions is the focus of many students to break through. Therefore, in the process of calculating each question, there are many "strange and ingenious skills" in the calculation after the column, and many students have their own calculation methods, while ignoring the problem options themselves. Here, I would like to mention to you a note, the choice of the calculation method is based on the topic option itself. The gap between the topic options is particularly large, and "presumptuous" estimation is sufficient; The options have a large gap and can be appropriately estimated; The gap between the options is relatively small, and it is necessary to be properly actuarial. Let's take a look at a few example questions:
Example 1] In 2018, the national Internet business revenue was 956.2 billion yuan, an increase of 21 over the previous year0%。Among them, Guangdong, Shanghai and Beijing Internet business revenue increased respectively. 0% and 252%。In 2018, the information service revenue of Internet enterprises was 859.4 billion yuan, an increase of 20 over the previous year7%。Among them, the revenue of e-commerce platforms was 366.7 billion yuan, an increase of 131%;The revenue of online game business was 194.8 billion yuan, an increase of 178%。In 2018, the Internet industry invested 49 billion yuan in R&D, an increase of 19 percent over the previous year0%。
Question: In 2017, the revenue of e-commerce platforms of national Internet enterprises was:
a.310.8 billion b314.2 billion c319.8 billion d324.2 billion yuan.
Answer] d. Analysis: According to the materials, the revenue of e-commerce platforms in 2018 was 366.7 billion yuan, an increase of 131%, then the following figure is sought, so D is selected for this question.
The gap between the options in this question is relatively small, so in the process of division calculation, the numerator does not change, and the denominator retains 3 significant digits for calculation, and the correct option can be selected. So if it's still this topic, the options are set as follows:
a.230.8 billion b281.2 billion c324.2 billion d389.5 billion yuan.
In this case, we can calculate that both the numerator and the denominator are two significant digits, which is approximately equal to 3300
billion, choose the closest C option. So what kind of calculation method we choose depends on the difference in options, and not any one calculation method can quickly help us lock in the correct answer to all the questions.
If the data increase is less than 5%, it can be called a small gap between options, and we need to properly carry out actuarial calculations; If the option gap is more than 5%, it can be appropriately estimated according to the option gap. Of course, the so-called increase does not need to be calculated exactly, and the long-term calculation practice will make everyone sensitive to the data. So let's look at another example question:
Example 2] From January to February 2020, China's domestic investors made non-financial direct investments in 1,733 overseas enterprises in 147 countries and regions around the world, with a cumulative investment of 1,078600 million yuan, a year-on-year increase of 18%。The turnover of foreign contracted projects was 108 billion yuan, a year-on-year decrease of 95%, the new contract value is 2150300 million yuan, a year-on-year increase of 383%。
Question: From January to February 2020, how much RMB did the average monthly increase in the value of new contracts signed between domestic investors and 1,733 overseas enterprises in China?
a.100 b.300 c.600 d.800
Answer] B. Analysis: From the materials, it can be seen that from January to February 2020, China's domestic investors signed new contracts with 1,733 overseas enterprises with a contract value of 2,150300 million yuan, a year-on-year increase of 383%。As shown in the following figure, select option B. 
All we can see is that the gap between the two larger options in this question is more than 30%, which means that the gap between the options is large enough that the calculation method can be appropriately exaggerated, whether it is the calculation data or the estimation range, as long as it can help us quickly choose the answer, it can be applied.
At the end of the article, I would like to emphasize that how to quickly select the correct answer for a data analysis question depends on the gap in options, and the calculation method is only a means to help us quickly select the answer. Therefore, for the topic of data analysis, we must first look at the gap between the options, and then use appropriate methods to calculate or estimate.
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