Uploaded January 2013 | Updated September 2026, 1 hour ago
An introduction to the concept of the p-value, in the context of one-sample Z tests for the population mean. Much of the underlying logic holds for other tests as well. I discuss what a p-value is, then using simulation I illustrate its distribution when the null hypothesis is true and when the null hypothesis is false. I then give a rough guideline of what different p-values mean in terms of evidence against the null hypothesis.
An introduction to the concept of the p-value, in the context of one-sample Z tests for the population mean. Much of the underlying logic holds for other tests as well. I discuss what a p-value is, then using simulation I illustrate its distribution when the null hypothesis is true and when the null hypothesis is false. I then give a rough guideline of what different p-values mean in terms of evidence against the null hypothesis.
