A maybe sounds abt right sorry if it's wrong.
Analyze sample data. Test statistic. When the null hypothesis involves a mean or proportion, use either of the following equations to compute the test statistic. ...P-value. The P-value is the probability of observing a sample statistic as extreme as the test statistic, assuming the null hypotheis is true.
What happens at that point is that the lining sheds through the vagina otherwise known as the menstrual cycle which occurs if the egg has not been fertilized.