Experts pointed out that most cities' nighttime consumption projects are far from meeting the needs of consumers. Taking tourism as an example, a survey conducted by China Tourism Research Institute shows that nearly 80% of tourism enterprises in China invest less than 20% in nighttime tourism products; 72.99% of the 657 tourism enterprises participating in the survey provide less than 30% of nighttime tourism products. There is still room for improvement in the quantity and quality of nighttime tourism products. "At present, in China, urban nighttime economy is still dominated by catering and shopping. The supply structure of nighttime consumption needs to be further optimized to comply with the trend that consumers are upgrading their consumption from commodity to service." Zhao Ping, director of the International Trade Research Department of the Research Institute of the China Council for the promotion of international trade, said. Wang Yun believes that governments should encourage business entities to provide new formats and models to meet the needs of consumers by giving certain policy support to business operators, such as reducing the price of electricity at night, giving certain subsidies to cultural performances at night, etc.

Please come up with a question about the difference test (matching sample) of two population means in this background. For the students whose student card number is ended with an even number, the question should use two-tail test with critical value approach at a significance level of 0.05; For the students with odd ending number in the student number, the question should use the upper-tail test with P-value approach at a significance level of 0.01. Sample size n = 20 - the last number of your student number.(20 points)