Chi-square tests for count data: Finding the p-value

I work through an example of finding the p-value for a chi-square test, using both the table and R.

[scooby]

4 mins in and I understand more than I did this entire semester. Thank you!

[Liminalitytv]

Man, I have read 2 statistics books trying to figure out how to apply chi-square to my archaeology thesis results and I just could not get it to click. Not only did this video help me understand it, it also proved the hypothesis I was testing right. I am so pumped right now, thank you so much!

[AJR]

After wrestling with one problem for almost 2 hours, trying to figure out what I was doing wrong on the higher and lower p-values, this got me the answer in less than five minutes. THANK YOU!

[mundanemuslimah]

Thank you very much! I've watched countless videos trying to understand this concept but none explained to my understanding. Tomorrow God willing is my exams and I'm now understanding thanks to you. Good job continue making videos like this👏

[bekobeko]

Better explained than in the book or by my professor. Thank you very, very much!

[Justeeson]

Thanks, was straight and to the point. Helped me for my finals :)

[TheDarkAndFallen]

Thank you for this! This video saved me from a lot of stress. I'm doing a statistics course online on pearson my lab and mastering, and it just doesn't explain well enough how to do a problem. I could not figure these problems out to save my life, but then I found you! :) Thanks a bundle!

[jbstatistics]

You are welcome. I'm glad you liked it.

[benjaminabraham]

its baffling how I've scavanged the depths of SAS how-to videos to figure out which Chi-square value relates to the the chi value and appropriate p value to use for a reserach manuscript, and the answer was in a video that doesn't even talk about SAS.... thank you sir for your amazingly simple explanation!!!!

[toonhamefish]

Thank you for your videos! I really appreciate them. Very easy to understand and your voice is so pleasant to listen. I should have found them earlier so I didn't have to feel completely blank in the class and pathetic as the exam came. 

[jbstatistics]

Thanks for the feedback. I've taken the approach of having specific videos for specific situations. I try to keep it concise, and try not to repeatedly cover the same information. In my other videos I discuss the meaning of the p-value, and how we'd use that p-value to reach conclusions in different scenarios. This video is specifically a how to find the p-value video.

[LokiWizardOfTheDark]

Nice. It would also be useful to explain in this case how to interpret the validity of the model under test given the p-value found, i.e., how one could accept or reject the null hypothesis. If I understand this means you have a 6.9% chance of getting a chi-squared value of 7.1 or greater for 3 DOF given your model of expected events. If you choose a significance level of 0.10, then you would reject the null hypothesis (your model is correct), if you used 0.05, then you not would reject it.

[sheepstop]

Thank you for explaining this so clearly!!!

[jacobbardwell]

Eh Bruv, thanks for the informative video! It would be mighty brilliant and greatly appreciated if you could explain the process for the p-value of a left-tailed test w.r.t the Chi-squared distribution. Thanks again mate, cheers!

[aamirghanchi]

Thank you for the video! I find it disconcerting that there is no separate formula for the actual P-value we are trying to calculate here (Area to the right of the observed value). It is very easy to get wrong results if we don't subtract it from the integer 1, especially when the function name is "pchisq()"

[katibsareeh]

Thanks for this great effort. If the calculated value of Chi-Square was equal to the critical value should we accept the null hypothesis or acept it?

[vaibhavkhobragade]

This video I specifically looking for and finally got! Thanks

[Sunflower-kykh]

Thanks lots of love and support from Pakistan 🇵🇰 ❤️

[doobeegemade-wurp]

thank you so much, loved the explanation. I just had a question, I was wondering if is it normal to not have a value range on the table, meaning that you will not have a P value, for instants I am doing the chi on a genetics problem so what I got as my X^2 was around 5040.11 with a 7 df and that is not on the table and I also tried the R and it gave me (1) 0 so I was wondering if that is normal

[minakshiboruahnitmz]

@0:40 expected or observed can never follow in accordance wid null hypothesis bcoz if any one follows then the distribution will be affected changed and the null hypothesis will be eventually guranteed true. as the expected will be very far from observed. Ok my mistake I thought the two variables as Observed and expected...ugh