P value

P value is associated with a test statistic.

It is the probability, if the test statistic really were distributed as it would be under the null hypothesis, of observing a test statistic [as extreme as, or more extreme than] the one actually observed.

The smaller the P value, the more strongly the test rejects the null hypothesis, that is, the hypothesis being tested.

A P value of .05 or less rejects the null hypothesis "at the 5% level" that is, the statistical assumptions used imply that only 5% of the time would the supposed statistical process produce a finding this extreme if the null hypothesis were true.