I was going to turn in my science project without a t-test because I couldn't figure out how o do it. Friends were trying to help me and I still couldn't understand. I thought about KZfaq. Dude really saved my life. Explained everything. Thank you so much

Really clear instruction. Thanks for taking the time to do this tutorial for us. There are many, many statisticians who seem to enjoy making the subject inaccessible. Whoever put the help together for MS Excel is a sadist.

Six years later and this is helping me dearly with my high school advanced scientific research class, thank you VERY much.

So concise and straight to the point. I found my favorite stats tutor.

The most understandable video about t-test I have found. Thank you very much for help!

God damn I love when stuff like this is explained clearly and concisely, thank you sir!

I appreciate this Jim! You just helped a Gifted and Talented Department in a school district in Northern Nevada!

Hello Mr. Grange, My name is Celio, I'm from Brazil. And I spent hours searching for an easy and practical solution in Brazilian sites. And I just saw your video and solve my problem with statistical data analysis. Thank you and the video is great!

Much appreciated. Elegant and simple, as well as easy to understand. Well done and thank you!

This is the best explanation I've found to describe a t test. Thank you!

We have to do several experiments and labs at school that require to find the p value in excel, and I have used this video several times to help me find it each time. It's so clear and it so easy to understand! I searched for hours trying to find an easy way to understand how to find it and couldn't find one until I found this video. Thank you so much for it! It literally has saved me (and my grade)!

I hope you all find this video useful! If you have any questions, please do drop me an email. And if the video has REALLY helped and you want to buy me a beer, please see www.paypal.com/donate/?hosted_button_id=L692FVF8PNUKU

This has been a great help to me. It is now very easy to get a "p" value from the "t" test. I have developed a "one-tail" test proposal for myopia prevention from your analysis. Thanks!

Thank you! This quick and easy tutorial helped me put theory into practice for my research project!

This is the clearest I've heard it explained. Thank you

You are the man!! not only i know how to calculate t-test but you made me understand why it is!! you have saved me a lot of reading. Great job!! :)

This is VERY GOOD. I had "forgotten" some of this - and your review was very valuable to me! Thanks!

Thank you for the explanation! My genetics professor expected us to already know how to do this and did not explain it.

This is extremely simple and helpful. Where I trip up is when all the books say "we reject the null hypothesis" or similar instead of saying "This means these are different significantly" or similar. I reach the end and I'm thinking "What was the hypothesis again?" This is what youtube stats is good for. Thanks!

Thank you for the simple explanation. This has helped me greatly

Thank you so much! This was super easy to follow and made it easy to understand even though it's been a while since I took stats. Thank you again! Life saver. :)

The numbers Mason, what do they mean?! - Call of Duty Black Ops

Had to watch the video several times but I understand this so much better now! thanks!

Thanks so much for this video, saved my life for a last minute presentation!

Thanks for the video. Short and to the point.

Very helpful information, we need more people like you in the world!

To the point and concise explanations make your videos the most favourite

simple, clear, perfect....THANKS!

Thanks a lot for the explanation, made otherwise a confusing topic easier to understand.

Thank you for sharing your knowledge in a simpler form. Very much helpful.

3AM in the morning couldn't find a better video than this.. Thank you for the video!

You saved my life! thank you so much - your video was so useful!!

Excellent explanation, thank you very much!!!

Thank you, This was very useful and well explained.

This helps me a lot. Thank you so much😭 I've been struggling to do the t-test but after I saw your vids... I understand it now.😭❣️

Excellent. very easy to understand. now I can do my own t-test sheets and statistical mats on variables

clear and brief! this is very helpful! thanks a lot!!

Fantastic video! My SPSS license from school ran out so I had to use excel, this video was very helpful :)

thank you for the instructional, informative, and concise video. it really helped me a lot.

Thanks a lot, better than many other professors.

Okay I know it's been 9 years but thank you so much for this video! I was freeking out couse my teacher couldent explain it in a way that made sense to me but this was so easy! it kinda helped my final exams a lot

Hello can you add link to video assessing if there is equal variance that you reference in the video?

You can't imagine how usefull it is ! I din't undertand ma university homework and you did it in 5 min.

Thank YOU for the VERY clear video!

You are the legend I been looking out for. wasted 2 hrs on web research. Thanks

Thank you so much this was really useful and easily understood!

Thank you so much Sir! I have an interview in 40 mins. I always gets confused while explaining t-test. best explanation. Thank you!!

Great help, cheers for the video!

Very Helpful presentation! thank you!

you saved meeeeeeeeee best tutorial!! Thank you thank you thank you!

Great help. Concise and clear.

Thank you! This video helped me for my final! Also, I love your voice and your accent. =]

Thank you so much! This was incredibly helpful!!

Thank you very much! Your instruction is straight forward thus understandable, that helps me to solve my problem.

@DarthHako Yes, you can. The exact formula to use changes with whether you intend to test a between-subjects design or a within-subjects design. For a whithin-subjects design, your t-value = D_xy / (sdD_xy / (sqrt(n)). This looks complex, but D_xy refers to the difference between condition x and condition y, sdD_xy refers to the standard deviation of these differences, and sqrt(n) is just the square root of the number of observations you This website explains it better than I can: have.www.unt.edu/rss/class/Jon/ISSS_SC/Module008/isss_m8_introttests/node3.html

Thank you so much, that was really really helpful

It was such a great pleasure to watch your video. Wonderful clarity. You would not want to give up your day job but you would be a star with the BBC World Service with your superb communication skills. Many many thanks. Best wishes.

You saved my life! Thanks so much

Very simple and clear explanation! Thank you so much

Mind blowing video...thank you so much

You have saved lives today

This was so helpful. Thanks a lot

really really great video!!!!!!!!! It helped me A LOT!!!!! THANK YOU!!!!!

Fantastic, ur video was on point and simple. 👍🏻

Thankyou this has been stressing me seemed so complicated 😂🙏

thanks a million. so clear and precise

This is the best i cant thank you enough!!! Greetings from a student form the Netherlands :)

thank you so much for your help!!

I so appreciated this video. I have no stats background and do not need the "full math" explanation for what I need to do, and this was perfectly clear and concise!

very clear, looking forward to sharing with my students

thank you so much! very helpful!

Really fantastic video - I will be sharing this with all of my coworkers, it helped immensely!

Helped a lot, thanks so much!

thx you saved my exams :)

soooo helpful. thank you so much

The E-106 means that you have to move your decimal place to the right 106 places. So your P value would be VERY small eg 0.0000000000000000000... ect. Your data is significantly different :) Hope this isnt too late!

excellent video!thank you.

still relevant and very helpful, thank you

super video. very good practical help. Thanks.

you taught me more than my teacher.

Thank you for this.

great video! Very helpful for my work.

Thank you for uploading all these videos. Great work and very helpful. I have watched your video on t-test. At some point you are saying that we need to decide whether we have the same variances between the 2 groups and I believe that you are saying that this is explained in another video. Could you please refer me to that video? Can we find out by using excel? Would this have anything to do with Levene's test? Thanks again, Athina.

perfect you saved me thanks!

Thanx a lot it's so clear.

Thanks so much! A question, what if I want to test whether values in an array (they are in fact simulated values) are statistically significant from a particular actual value?

great vid. thank you

SUPER USEFUL!!!

Really helpful thank you.

Great video, one question: what if my dataset is imbalanced and I have more than 5 times the amount in one vs. The other? I guess since it uses averaged valued it wouldn't matter but, can you do it?

So good, thank you.

Jim, I am currently doing my dissertation on how carbohydrate intake effects blood glucose. Can I first of all compliment you on the efficient and easy to understand video on t-test's. This is often an area of confusion for my peers (me included). I have just shown this to the majority of the class, all of which will be using to do their t testing along side SPSS. Thank you

Thank you mister!

Thank you very, very much. It's probably a very easy thing for you, but it was actually very confusing for me until I watched your video. I have a question, though, if you'll excuse me: If I already have the means, SD-Variance and such descriptive results, can I still compare the means just by using them without the actual measurements for each, say, individual?

Oh my goodness thank you so very much!

Thx. Very helpful.

Very informative in 5 minutes.. i studied this in my doctorate degree for a year in my statistics subject,-yet headache came on my way 😂 So in 5 minutes, i learned this the easiest way😂

thanks so much. u are a lifesaver! will treat u to dinner if ever u come to taiwan!

Superb 👍