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Normal Distribution & Z-scores
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- Опубліковано 29 січ 2011
- This video shows how to calculate "inside areas" and "areas in the extreme" in a normal distribution using Z-scores. This video can also be found on my website statstutor.book...
thanks for taking the time to put this together - guys like you make the world a better place by freely making education available to the masses for free - you rule!
overpriced academia be like "THEY TOOK OUR JOBS!"
Oisin Hughes stay blessed
Oisin Hughes
Thank you very much.
My form teacher are perfectly in knowledge however he doesn't know how to teach ,under his teaching the students cannot really understanding what is real normal distribution and only on remember the fix formula.
If you remember the formula you get the score
If you don't,you can't pass the exam.
That was why most of the our class had failed this subject years ago.NOT on understand but on memory
Oisin Hughes this had shows the difference way on the teaching.
Instead of memory teaching.make students understand are more helpful.Thanks you again
ua-cam.com/video/029laWCUOj4/v-deo.html
I love how you did it multiple times. Its 1 million times better than other vids when they just show you once. This really gets it through your head.
your head! It like most degrees are apparent to me before doing them!
whos here for tomorrow's exam
lol me
me grade 9 student huhuhu
ME ME
hahahahah me
SAMEEEEE
After hours of laboring, and countless youtube videos, I finally got one that broke it down in bits and pieces. For one who is coming from a not too sound mathematical background, this video has been a life saver in understanding normal distributions.
I'll now go ahead and tackle probability with this new found knowledge.
Muchos gracias!!!
this is honestly what I look for in a online math video , no rambling... you nailed it.
Way easier to understand than my stats prof
+GoldenArrow AGREED
For those of you who have different charts, you're suppose to subtract the z-scores from one another instead of adding them like he does. For example, with the second problem: If you look at your chart and get .02275 for -2.00, and .97725 for 2.00; SUBTRACT them. When you subtract .02278 - .97725, you get 95.45. It isn't 95.44 but its close enough...
I did the same thing with the first problem. I got z-scores .15866 for -1.00 and .84134 for 1.00. When I properly subtracted them, I got 68.26.
Thank you so VERY much for this comment! I was going crazy trying to figure out why I couldn't get the same answer!!
Straight forward, simple, no unneeded explanations. Just what I was looking for. Thank You
so much clearer and easier to understand than coming from an old PhD professor....and the book. needless to say what i spent hours trying to comprehend I easily learned by watching this video twice. No bs. straight to the point. How teaching should be.
My teacher was explaining this to the class for around 2 classes and most of us didnt get it. This video is the best!
Seven years later, a random Turk from the Netherlands comes by, learns what the system didn't want to provide, or assumed we already knew, and leaves again. Thank you for putting this here. Out of all the videos out there, only yours helped me out.
clear as hell, i was doing CFA level 1 test and struggling with normal distribution! your lecture is amazing.. it helps a lot, thx buddy
Just wanted to say thank you! I'm in beginners Stats class and could not figure a certain problem out...random person scoring above 65%. Your instruction on IQ of greater than 130% helped me out! Thanks again!!
Thank you so much for keeping this video concise, simply and straightforward. The hours I have invested in this week only, by being at Uni have tested my sanity in regards to normal distribution. It is now getting synthesise in my being slowly but surely. My lecturer, oddly enough commented on how many tabs I had on my laptop when helping me with something , little does she know I have spent about an hour and a half just searching through videos on this subject….I wish I had found this earlier . It just shows you the algorithm is truly watching your moves…. Just think about that for a moment. Thanks again for your generosity.
I was in a 3 hour lecture at uni not being able to understand it at all and you explained it in 10 minutes.... impressive ! Thank you so much.
Thank you! This makes so much sense. My book made is seem like greek! Please post all of your teachings! Teachers like you make the world a better place.
This is a miracle. I didn't get this until I watched your video and my final is tomorrow morning. XD thanks for sharing!
how did your final go?
+Moonfall Hey as someone who has written a final on this, can you please explain the last example? He spoke about a standard rule and 3 standard deviations...what is that all about?
I'm in the exact same position, 6 years later XD
I have my first math exam in two years tmrw and doing the textbook problems had me so stumped. I'm solving these with you and pausing so I can test myself and beat you to the next step. I'm nailing all these and feeling way more confident about not only solving the problems but also about the logic behind it all. Thanks so much for this great video :)
You're a life saver! Been studying for final and was having issues until watching your video. THANK YOU.
Thanks for not talking too much and making it sound so easy/simple!!!
Americans are the most Generous People on the planet top education for free.
I never meet people like you here in Germany
I love America.
clear and very helpful
Yes, our education system is awesome because we give financial aid to people that can't afford school :) Most of us are generous with knowledge too.
supirior thinker how are u so rude to ppl when youtube name is spelled wrong? humble yourself and stop with the negativity
you are genius...at least for for me .. you are between those very tiny percentage of people who can explain this in such a easy way ... God Bless
This professor is so awesome that Majority of people can understand Z score calculations within 10 minutes :)
finals in about 2 hours and you made more sense in 10 mins than my lecturer in 3 months - thank youuu
The most easy and useful in all UA-cam videos of normal distribution thank for easy explanation ready for exams now
you made this so easy to understand in 10 minutes when my teacher spent 1 hour trying to figure out how she did it the first time... Thank you so much
you explained what my professor (who has a phd and whos been published dozens of times) could not. Sir, I tip my hat to you, and id like to buy you a beer (if your ever in the area). Many thanks.
thanks so much. learn more in this ten minutes than class for the last two weeks
My instructor is incredibly bad. He rambles, starts and stops at odd points, and generally makes no sense. He does a poor job of relating the information he's spewing out to what it actually represents, and to top it all off, he wrote his own text for the class which makes just as much sense. I had no idea how to do my homework. Class has been in session for almost a month.
By 7:47 in this video, you've already managed to teach me more than he has thus far this semester. I can't thank you enough for posting this.
My poor head don't understand the concept yet , but after strolling dozens of videos , your video game high hopes , thank you , i like the steps you go through, my professor is like a hurricane !!
The percentage of dislikes to likes for this video at this moment is 234 out of 5.7K or 4.1% lying outside 2 standard deviations or 100 - 2 x 47.72 = 4.56% ! Meaning the dislikers are insignificant critics to this well-made video. Thanks pspollard1 !
THANK YOU SO MUCH. I have a college class certification due in 4 days and this really helped me understand bell curves and standard deviation with percentages. You rock!
LOVE how simple and to the point, you make this!
Excellent. This example can be replicated in any set of scores - including employee performance , Ranking of companies in revenue performance, etc.
This topic can be really difficult the first time learning them, but once it clicks (Which can take a while), it's not so bad. You seem to help it click a lot more quickly than it otherwise would!
first person out of 10 I've seen to not fuck up the bell curve by allowing to touch the x-axis. good job
Best video for Normal Distribution & Z-scores.. -Thank you for this!!!
This has to be 1 of the best video out there on Zscore...thanks
life saver thank you for this video because my teacher in statistics get mad on us then he told that he is going to have a quiz but he didnt discuss this very well
thank you, this helped so much. i can not explain how glad i am i found this video
you explain it very concisely and it's straight to the point. It's helped me tremendously. Thank you. I think, learning the symbols that correspond to this language are the hardest part when understanding this concept. Also, it's essential to understand the formula when solving these problems. My Professor didn't explain it so I understood it or didn't take the time. Your online video shows all this in an easy to understand format. Keep up the good work in helping people work through challenging concepts in an easy manner.
This was amazing. I finally get z scores. I love the fact that you went step by step and gave several examples. Nicely done
How come the Z table I was given in class is different ? at 1.00 on my Z tableI have .8413
i got that allso that value but i did i the sci cal...not actually on z table
It's because the area for the z in your table starts from -3.5 to 3.5. Not from 0 to 3.5.
For your case, just subtract .5000 of the given cumulative area.
Sorry for posting this 4 years after your comment.
same
AJ Radaza lmaoooo 🤣🤣🤣🤣🤣
@@AJRadaza no thanks for posting this.I am having problems and this was helpful...but mine starts from _3.0
I like this explanation. It's simplified and dummy-friendly.
supirior thinker, 1. plz correct your spelling first, .....2. when u feel urself superior and start to boast, u actually lose ur ability to learn more...there are still millions ideas to learn....and 3. ur bragging looks like u really learnt about "black-hole" at 15 becoz by then u started reaching adolescence...4. I learnt by heart an epic book >2000 pages "mahabharata" by 10, calculus by 8, steriochemistry by 12, Molecular medicine by 15, and completed my phd in 23.... !!! and still i am learning basic statistics becoz, i missed learning it since long !!! so fuck u !!
Thank you so much! My final exam is in 30 mins and you’ve made this really clear for me!
Is it too much to ask for additional examples? This was BEYOND GREAT and something I haven't seen that goes straight to the point!
i finally understand how to apply the information from class. thank you so much
te iban a raspar con esa materia.
Ivan Burgos iban... jejeje ahora no
Dios te bendiga muñeco
my life was missing this information. Good work!!!
i have an exam after 3 hours about this .. i am very thankful for u
Excellent work. The only confusion might arise from calling the table data that you look up “distances” when they are actually the AREA under the curve. You do say area in the example where you have to subtract it from 0.5 to determine the “greater than” AREA. For those of you with the double data values, you4 chart is giving the area between the -x and +x value of the z score.. so it’s double the area.
You are right. It is formally called "area under normal curve"
Finally! an explanation that makes sense!. thank you so much! i've spent hours trying to figure this out and you did it in 10 minutes.
This has just saved me from failing stats due to having a terrible professor! Thank you so much for the video!
omg hes saved my life! i was freaking out about my exam coming up
I have an exam in 1 day and you literally saved me.
Thank you! You made it simple to understand. The CFA study guide made used 900 variables and made it so impossible to understand. Could have explained what the z score and z table mean in one sentence.
you are the first person I unstand. prof always keeps in algebraic form but idk what it stands for when u break it u take a hard problem make it simple
I now feel that I may actually pass this unit. Thank you so much for taking the time to make this video.
Thank you so so much!!!! This is the best video I have seen so far!
Thank you so much :) I realized I should thank each video that teach well. You are one of them, Mister! Keep going :)
You are a life savior Sir
Thank you so much for the most simplest breakdown ever!!!!!! I wish you taught at a college near by my residence. Thank you
Thank you sir! I was trying to learn this from the text for the last hour.. you made it so much easier!!
@rockentui You may be getting confused by the two different chart versions like I myself was a few days ago. It seems like the most common chart used in classes is the "Area from the left" chart while this video is using the "Area from the mean" chart. Add a .5 to the last value on his chart (Z=3.9) and you will get the .9990 that is on the "Area to the left" chart.
I can't believe it's that simple!!
Thank you so much for making my life easier
I search lots of videos but finally I got it ...thank u. So muchhhh
Thank you sooooo much! This makes a lot more sense than it did in class.
I know this video was uploaded literally 8 years ago, but now it all makes sense and I’m going to pass my standard
Finally understood how this works!!! THANK YOU SO MUCH!
Thank god for you. I fully appreciate the clarity.
thank you bro! i need this tomorrow for my exams
have a test tomorrow and this video just saved my life
Thank you very much for your explanation! It helped me a lot to understand better the normal distribution!
You teach this soo much better than my teacher. She made it far to complicated and didn't explain it aswell as you did
Love this you explain nice and simply that it looks so easy to understand now...Thanks mate
OMG THIS IS GOOD THANK YOU FOR SAVING ME OF MY SCREWED UP LIFE. MY EXAM IS IN LESS THAN 12 HOURS
thank you so much. this video has helped me heaps. i didnt understand this at all until i watched this. great information
This is excellent video..i got full of knowledge about normal distribution through this video..
thank you very much
Perfect! Straight to point explanation. My Professor just reads off a PowerPoint!
@danpluso you're right! Another way I look at it now is instead of adding .3413 and .3413 we substract it! So because I use the "normal" table from my textbook, or "area from the left" table. The figures would be 0.8413 - 0.1587 and voila 68.26%. Thank you danpluso.
This video is absolute genius! Thanks so much, you made it just so easy to understand
Thanks a lot
after watching this video I get rid of my confusions regarding normal distribution
i am fucked for this exam god damnit
This guy is so good and I'm learning this stuff in my sophomore year
Of high school
Hello ! I've just watched many videos about standard deviation and couldn't understand what exactly it was. But after watching your video, within three minutes, i totally understand what the standard deviation really is. Your video really worked for me to understand it, Thanks !
Thank you so much for the examples! Best video of normal distribution I've found on youtube :)
This helped refreshed my memory! Have a final tomorrow
When my teacher introduced this topic I got overwhelmed by the name, goos thing she linked your video to the classroom.
Thank you so much it is very easy to understand normal distribution after your explanation 🙏
Thank you so much. Failed statistics. Must now help my daughter. I now understand z scores. You might just help her pass!
thank you for this ... short & straight to the point
Thanks so much. I have been looking for help on this for like an hour thanks again
Thank you so much for making this video, it was really helpful to prepare for my exam. Now I can say I understand Z-scores XD
Great tutorial. This really helped me to understand normal distribution and z graphs.
Very nicely presented - it`s all much clearer for me now - thank you!!!!
Really great explanation. I wish I would've seen this video before I crashed and burned on my test :/ But thanks for putting this up. Super helpful!
Bless your soul Man, you just saved me
FINALLY UNDERSTOOD THIS THING!!! THANK YOU
Thankyou for the video, it really helped to how this precisely and clearly
Studying for the FE. Thanks for your video!
2:19 I might be wrong, but I think the entry in the table represents the area under the curve (the percentage of the total 1 under the curve ) if Z-score=1 rather than the "Z-score". Consequently, in the following graph, 0.3414 should not be present as a distance, but an area.