system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What is P value and why is 0.05 so important?
gpt
When doing studies that have some probability factor involved in it (say randomly sampling people), there is a chance that you may conclude a fact about something simply because of random chance in your study. Say for example it can happen that you flip a coin 4 times and every time it lands on heads. And then you conclude that all coin flips must land on heads as a result of that, which is wrong. This happened because of purely random chance.

A p value denotes the probability of your experiment happening the way it did the way it did. A p value of 0.05 means there is a 5% chance that the results you got support your conclusion not because there is a bias for some reason towards such results (say a coin is heaver on one side than another) but because of just dumb luck. 

0.05 is just known as the gold standard for concluding that something is "statistically significant," that is probably didn't happen because of dumb luck. But smaller p values are better, and should be possible to reach if there is a true correlation although this generally means doing a more expensive study.