What is a p-value and how do I calculate it?

What is a p-value and how do I calculate it?

A p-value is a measure of the evidence against a null hypothesis. To calculate it, you typically perform a statistical test.

Can you give me an example of calculating a p-value?

Sure! Let's say you have a sample mean and you want to test if it significantly differs from a population mean. You would use a t-test.

What if I have a large sample size?

For large sample sizes, you can use the z-test, which approximates the p-value using the standard normal distribution.

How do I interpret the p-value once I have it?

A p-value less than 0.05 typically indicates strong evidence against the null hypothesis, suggesting a significant result.