What is the null hypothesis of regression analysis? . .

Zero hypothesis, statistical terminology, also known as original hypothesis, refers to the hypothesis established in advance when conducting statistical tests. When the null hypothesis holds, the relevant statistics should obey the known probability distribution. When the calculated value of statistics falls into the negative domain, it can be known that a small probability event has occurred, and the original assumption should be denied.

Zero hypothesis feature:

The null hypothesis of 1 is generally an intentionally overturned hypothesis;

Because the probability of the first kind of errors can be controlled by the selection of significance level, the null hypothesis is generally the hypothesis that if the first kind of errors occur, the consequences will be more serious.