The value of p is also called the strength of testing the negative original hypothesis. The principle of p value is: the overall assumption is the original assumption, take a sample. Under the original hypothesis, the probability value of this sample appears According to the principle that small probability events cannot occur in experiments, P value is the probability value of small probability events (small probability events that reject the original hypothesis). The smaller the value, the less likely the original hypothesis is, which can also be called the significance level of rejecting the original hypothesis.