What Is A P-Value? - Clearly Explained

What is a p-value? This is a question many scientists do not know the answer to. In this video, I will clearly explain what a p-value is.

Briefly, a p-value refers to a probability value between 0 and 1. This p-value value represents the probability of obtaining the observed difference (or a larger one) in the outcome measure of the sample, given that no difference exists between treatments in the population (the null-hypothesis is true).

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[Lolwutdesu]

To anyone who still doesn't get this, as the video is a little convoluted: the p-value is simply the probability that the results you've obtained from the experimental group (and no, it doesn't just have to be people) is solely due to chance. Ergo, smaller p-value, smaller chance of it just being due to luck/chance.

[georgezhang]

I finished my undergraduate in mathematics this year and now I finally understand what p value means

[ASMMEGY]

Convoluted video, not simple at all for beginners, thank God I'm not a beginner. Simply P-Value is the percentage of Luck and False positives affecting your results instead of your experimented factors. So in an even more simpler way: P-Value % = Luck, the less % the less luck and more real effect of factors experimented by you.

[yavorkaludov]

Incredibly well explained! The first time you gave the definition for p I had no idea how to interpret it. 5 minutes later I understood the same definition perfectly.

[GuineaPigLuna]

YAS! After 3 years of college as a bio student, I finally someone who can actually explain this!

[chinedumjoseph]

This is the best video that I have watched in the explanation of hypothesis testing. Thanks a million for this video.

[mattgardiner]

I have just come to this in my social sciences degree. I will be watching this video a great many times in the next few day's.

[SufiRepublic]

Finally i got an intuition about p-value, thank you, may the almighty bless you 🙏😊❤️

[ruzzaruzza]

Finally. I've heard it so many times and now I finally understand it! Thanks!

[nernaykumar]

One of the best explanation, the probability would be more interesting if all colleges have teachers like you

[sumayyahsalem]

I'm not sure how many videos I have watched about this topic, it has been more than 6 hours of me trying to understand it, but THIS, this is the only video that made sense to me, and I finally can say that I understand! TYSM!!

[calebm]

The more I watch this, the more I believe that it would be better to introduce the random noise concept when you were explaining the null hypothesis. So, we formed this null hypothesis BASED ON THE ASSUMPTION that our data were observed due to extraneous factors (random noise), like the mentioned high metabolism gene. If the noise is what contributed to the difference, then we CANNOT assume that the drug worked to reduce weight. IF the observed results were due to random noise, then our p-value tells us that we can repeat this experiment 50 times and only 1 of those times we could get this same (or more extreme) result. This is very unlikely, and so we can be confident in rejecting the null hypothesis and accepting that our results weren't caused by random noise.

[elvintiranbalan]

THANK YOU! I m trying to catch up with my studies and your videos helped so much! Also, it would be nice if you make more R programming tutorial as i love the way you explain things. It's really clear

[kbansal]

Boss, p-value of 0.02 is highly significant. P-value is probability of null hypothesis being true. At 0.02 alternate hypothesis gets selected.

[mdjaffer]

Very lucid explanation
Now I can understand what p value is atleast to some extent
Thanks very much

[krzysztofkosydar]

really great explanation - before I had a problem with understanding the p-value. The example with "two worlds" is a great way to explain what it really is. Thank you!

[thigilman]

Hello there, you say that the p-value is the probability that there is a difference in the weight greater than 1 kg between the two groups - provided the null hypothesis is true. Therefore, wouldn't it be more logical to reject the null hypothesis if the p-value were large

[hiteshlalwani]

wow! this is the only video that finally helped me get this
thanks!

[beatrizbuford]

What a great explanation! This is a content area in which I struggle and the visuals and explanations helped me understand the topic more. Thank you!

[esetekebede]

I really appreciate the way you bring us the example; this really helped me a lot thankyou!!