I'm continually amazed how fairly simple concepts are butchered so bad by my professor's course materials. Thank you for this video.

I was literally stuck on a statistics question for two hours, and I was searching everywhere to find a simple explanation. Finally, I came to you, and I solved the problem in a matter of minutes. I was so relieved when I finished! Thank you, from the bottom of my heart!

Thank you for dumbing this down! I've been in lectures this whole year listening to this and I finally understand it from watching your videos

You are simply THE Best instructor. So clear in your wording! Not a single extra, unnecessary, or confusing word.

This tutorial was extremely helpful. I am a visual learner and this is the first tutorial that literally stepped me through this process. Thank you so much - you are a God sent!! Great Video!!! Diana

This didn't teach me how to calculate literally anything.

Well, Brian I can't please everyone. The overwhelming comments are the pace is just about right. The data I get from KZfaq also indicates this as well. I guess next time you can always go watch paint dry instead of watching the videos. You are probably just to smart for my videos anyway.

Thank you David, it is extremely helpful. I am studying in one of the top business school and I have a Quantitative analysis exam. The videos had really helped me. I have also recommended it to my colleagues too. Cheers for helping.

Thank you so much for your videos! They really help in my MBA classes give me another perspective - great for new learners.

Good point and question. I have another video on hypothesis testing (see video description for link). It is called the rejection region because if the test results fall in that area you reject the null hypothesis. You are rejecting the null hypothesis.

Finally some videos that explains it in a simply way with illustrations.

Appreciate the referrals! Good luck on your upcoming exam as well.

@CherieJohnsonLibra Well, yes we can assume that the area (or percentage) in both tails are the same for a normal distribution.

This video is so helpful, i just understood the logic thanks to you, superb...

totally get it now, you just made it easy for me to tell the difference between the two. thanks

John, tools are always a good idea. Too often students are asked to pound these problems out by hand.

Thank you so much for making these videos! Its helping me prepare better for my stats exam!

Thank you. Good reminder. Covered what I needed to remember to get a n-dist 1 tail 95%

You are very welcome and good luck in your stats exam too.

Your Animations do help understand topics better. No type 1 error. :) Thanks a lot Professor. Wishes for New Year.

Diana, thank you for such a nice compliment! I have other channels on economics, algebra and calculus too. Make sure you like MyBookSucks on FaceBook (see link in video description). You can see the links to the other channels plus this helps others find my visual approach.

Prof you are great guy,thanks countless time for this well illustrated and explained tutorial. God bless with more wisdon.

Very clear explanations, thank you!

thank you so much for making this! It's very helpful!

@madgaskin I do have play list on my channel statisticsfun and specifically watch the video -- "Hypothesis Testing Type I and Type II Errors"

Well, thank you for such a wonderful compliment. It is much appreciated.

My goal was to understand what p value is. Thanks, explained beautifully

thankiew so so much for taking the time to do these videos!! they are exceptionally helpful!! you're the BEST~!!

hanks for sharing your knowledge

Just what I need to know for my stats class. Thanks so much

I love your videos! Keep up the good work :)

This is really helpful. Thanks so much!

Will add more examples too.. I would encourage you look at some of the playlists on my channel statisticsfun. I do have some numerical examples too (depends on the topic).

You are very welcome and I am glad the videos are helping you. I plan on posting more material. I also have channels on economics, calculus, algebra and trig. Make sure you like MyBookSucks on FaceBook (see video description for link). This will help other students find the educational videos.

Dear sir, thank so much for the useful video. I am wondering about the significant p value for 1 tailed and 2 tailed analysis. Let's say if we compare 2 treatment A and B, we see sig. 2 tailed value of 0.08 (then we conclude that no statistically difference btw 2 treatments). but the 1 tailed p value, in this case, is 0.04 which we conclude treatment A is (let's say) statistically more effective then treatment B. My question is, if we cannot say they are different (2tailed test p value), how can we conclude A is better than B? thanks

You are very welcome! Make sure you like MyBookSucks on Facebook (you can see the link in the description of the video). And if you don't mind tell your friends (ease their pain) about MyBookSucks. Thank you for such a wonderful complement too.

Jessica, you are very welcome. Great to hear the videos are helping you. Make sure you like MyBookSucks on FaceBook (see link in video description). This will help others find the educational videos.

Super helpful! Thank you!

Amazing video!

Wow and now I understand! Wish my stats teacher did this (or showed your videos).

soooooooo clear !!!! You rock and I'm grateful for your video.

Thank you for the video.

Why can't my teacher explain this like you?! :-) Very helpful video

@anchoill that is the area in the tail for a "one tail" test for 95% confidence level. I would encourage you to watch the video "Understanding Normalized Tables Z scores" on my channel.

thank you brief and useful:)

U r such amazing making things simple and easy.thank sir good job

Very helpful, thank you

You are very welcome and happy new year to you too. Make sure you like MyBookSucks on FaceBook (see link in video description). This will help me spread the word about the educational videos.

Do you have a video explaining how you got the critical values at the end of the video? I have trouble in my class finding critical values. Thank you

Where do you get the 1.96 and the 1.645? Mathematically....how did you obtain those numbers? All we know are percentages....

It is good you found it now! Make sure you like MyBookSucks on Facebook (see video description for link). This will help others find the educational videos.

Great video. Would you explain deeper what the p-value means?

Thank you! 🙏

You're Amazing!

Thannnnnnnnnnks! God bless you for this!

I didn’t understand a word, I just want to know when it’s a two tailed or one tailed from a percentage and a larger or greater sign

so for one tailed tests the critical region will read 1.65 instead of 1.96?

Thank you. Very well explained. I wish I would have watched this weeks ago. My book sucks.

You are a million times better than my useless university lecturer thanks a heap!!!

I'm little bit confused about the p-value approach and critical value approach. Use the p-value approach if it is a two tail test; otherwise, use critical value approach if it is a one tail test, either left tail test or right tail test. Am I right?

very clear, thank u so much

Salam to very very good method-and-substance-teacher

What if the two tails are not the same % value? Do we always assume they have the equal percentage distribution (in this example, both of the two tails have 2.5%).

I definitely will, your videos have helped me get a better understanding of what my assignments talk about, just more examples with numbers would be nice. Do you have anything on P-values? Im currently doing hypothesis testing and am having some issues.

Which test do you use for the One tailed ord two tailed?

Thanks Sir! we'll have our exam later. Godbless

Thank You!!!

you helped alot. thanks.

First of all, thank you for this video! It clarified much confusion I was having. I have a question though regarding the rejection region. What if the research results show high numbers in the rejection region? How is that represented in the bell curve? For instance, if the test was based on the theory that ibuprofen has no effect on fevers of 102 degrees or above and in the sample population 94% had a reduction in temperature after taking ibuprofen how would the t-tailed test reflect those results when only 5% is the area of rejection? I am really trying to wrap my head around this but I cannot figure it out. Thank you - Brenda

Excellent representation :)

how did you get the critical value of 1.96 & 1.645 one-tailed test?

with some sample data set it would make more clear , i want to know how we find direction of result ? then we can take decision whether it is one or two tailed

sorry one more question, Is that bell curve the standard deviation? and would we have to figure that out first before we do a significance test?

Understood everything up till the z score; how did you get them please?

great stuff

where did you get the figures - and + 1.645? Thank you.

Do you use the two sided test results when testing for two sample means? How do you know when to use 1 sided test results vs two sided results?

just have a question, how would you find the t critical value if the question says the N= 16 and the test is 2 tailed with a.01??

Was that a mistake? You said alpha can be used as the p-value around 1:16. You don't "pick" a p-value. You compute it based on the assumed hypothesis and the sample results and then compare it to the alpha.

Awesome!

You are very welcome! Make sure your like MyBookSucks on FaceBook (see link in video description). This will help me get the word about the educational videos. Good luck on your exams as well.

If the 1 tail test is the full alpha value, why is it not the full critical value?

God bless broski

where did you get 1.96? I am not understanding this point.Please help me to know

Hi, so at 4:13 the C.I Level is at a 95% but for the critical value you put 1.645 which belongs to a 90% C.I Level...mistake or no?

The clip helps me a lot! thanks for your lecture. :)

How do you get the value 1.645

I meant to put what does one-tailed beast from Naruto rip me 2017

The sample mean does NOT lie in the green area. The sample mean is a single value - any point in the green area must have two coordinates. The sample mean lies on the x-axis. You should label your axes so you understand what's going on here.

Nice

Or you can use the normalcdf or tcdf function of your ti-83+ calculator.

Thank you for the compliment. Good luck on your exam! Make sure you like MyBookSucks on FaceBook (see link in video description). This will help others find the educational videos.

thx

I hope I can comment here with my question, and I apologize if my question doesn't make any sense: Is there a one-sample hypothesis test of proportions specifically for a small sample (less than 30)? If there is where can I find the formula for that? If there isn't is it ok to use z scores to do hypothesis test of this kind even with a sample of, say 20?

i like when he said party more study less

really helpful , thank u :)

thanks

you're so much better than khan academy!

thank you so much from Saudi Arabia country you are amazing

Well thank you! Make sure you like MyBookSucks on FaceBook (see link in video description). This will help others find the educational videos.