Z scores - Statistics

Learn how to find z scores and probability in this video example. You can see all my videos on my channel page / mathmeeting .

[@mariabenjamin6113]

I've been struggling with z-scores ALL DAY in less than 15 minutes you've made it all so clear! So glad I found this! Thank you!

[@campbellbrown2440]

I have a midterm tomorrow with this stuff on it and I was completely lost because of the language barrier between my professor and the class. Thank you so much for making sense of this for those of us who are not math-minded!

[@wh33l6r]

Terrific! Re: the comments below about why do all the extra math, seems that it helped elaborate the explanation to make it all crystal clear!! Great video! I've lost count of the number of videos I've watched about z-scores & tables, and you're the first person to say right up front that the 4 digit numbers in the table are percentages of the curve represented by the z-value. Bravo!!

[@janviergalle]

The subject is broken down to small steps; and step by step explanation makes the subject become clear, and illustrative, and thus very easy to follow to understand. Just one word: Awesome !! Thank you for making, not only this subject but also this world, one more step easier to understand.

[@Jellybeans-m9l]

intro to stats midterm in two hours. You just saved my bacon!! Thank you so much for your videos!

[@MrSpideryfingers]

We pay at School and have to learn here,

[@ZombiePanda501]

Classes are taught expecting students to study multiple hours a week

[@jacobhiller6731]

***** Then they shouldn't cost so much!

[@jeffersonfraiser8293]

this is grade 11 math so you shouldn't be paying to be taught it.

[@ALBANIAN4FREDOM]

***** I think the book make the problem look harder than it is, there are unnecessary words in the textbook or the test,they do this to confuse the student, you have to read the problem more than twice

[@KamiGami0109]

it really depends on the country you're in.

[@allabout1135]

I lost the count how much hours I spend watching videos to understand the Z-Score but it is so simple actualy. If in all high schools would be explained things as it was explained in this video, we has a so much succestfull graduated specialists around us. I one more time get confirmation, all is possiible to lear, just all depends how user friendly explanation used. Thanks!

[@kissCharles]

very layman, i came here after another KZbin tutorial which explanation was too complicated. you the man, i finally understood, especially when you brought out the Z table

[@lpsglitterpaws8536]

Omg! I’m taking statistics online and I feel like I don’t have a teacher. Thank goodness I found such a great and concise explanation of the concepts are! Thank you for sharing your math brain with us!

[@drdave5150]

Great Job! I'm so glad you went through each step and chose not to cut corners because College Professors want to see how you arrived at your answer not just what it is.

[@jenroberts7267]

An easier way is to subtract 0.06681 from 1, since the area under a normal distribution bell curve is equal to 1. Hence, 1-0.06681 = 0.9332 or 93.32%

[@marislox1844]

I was wondering why he complicated it so much, thank you!

[@CataclysmicKitten]

Thank you SO much. I was having problems with z-scores for my midterm tomorrow, and this lays it out perfectly.

[@justinemariannedj8395]

You just saved me from failing my midterm, you are an angel.

[@angeltorres5132]

Love, love your style of teaching. I was able to understand ALL your steps. Thank you so much 😘😘

[@courtneyelizabeth9559]

Thank you so much for making this video! I have been really struggling with my Statistics class and now I understand perfectly. You are saving my GPA!

[@CaptainSoftboy501]

+Courtney Elizabeth (Kotoni) Same :')

[@rockygarewal3388]

Thanks, I thought him.

[@anthonycarbonaro7890]

It’s very smart to announce your next video so that we can follow you as you develop these concepts…

[@dominiccuevas9699]

Thanks so much. My stats professor can hardly speak English so this is a life saver.

[@kevinevers2943]

You have done and excellent job explaining this concept!! I just added this video as a resource for my grad students.

[@darkmaniac11]

You. Are. A. Hero.

[@janviergalle]

Awesome !! Just watched it only once and i understood it right away. Thanks a ton !

[@martinczerwczak2904]

Thank you very much! very easy to understand and you do an excellent job explaining it. This probably just saved me an hour reading through the Z scores section in the chapter.

[@janefernandez7432]

i finally understand Z scores and Normal Distribution!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[@rockygarewal3388]

Thanks, I thought him.

[@empenmot]

best video I've seen on the topic! Thank you so much!

[@BerniceWesselink]

Thanks for your efforts, this is so helpful to me. Greetz from Holland!

[@josephsingh5236]

Good shit bro. I be passing my exams since 11 grade cuz you bro. You gotta become my tutor cuhhh I'll pay you 💰

[@SharonMcGahaStone]

thanks this helped me a lot it is simpler than any video I have found so far I have been searching for a simple explanation for three weeks

[@bayouelton]

. . . Good video and thanks. But why mess around with area 2 and 3 when you could have simply subtracted 6.68% from 1 in the first place? .

[@rocketrider1405]

I agree. No wonder people hate stats. He should be using a z-table showing tail probabilities. It would make it a lot easier to do it your way.

[@thaipham3472]

I think he just wants to point out the mean is at center

[@lenardmoxley1189]

can you explain the rationale behind subtracting one please

[@lenardmoxley1189]

why subtract from one

[@caseyjonas352]

Because the Z score of 60 (-1.5) in this case is below the average (the average is 75, and the average always has a z score of zero). If you're looking for something BELOW the Z score of 60, that's the entire area shaded from 60 and to the left (-1.5 and below ad infinitum), but if you're looking the probability of every score ABOVE 60, you subtract the probability of 60 and below (probability of -1.5 standard deviations from the mean is .0668) from 1 to find the remaining probability, which is .9332, or 93.32 percent. Hopefully I explained it clearly enough, but if I didn't please let me know.

[@Sophia-wq1gi]

You rock!!! Thank you! You make it so clear and simple.

[@olledejong8702]

Still watching this in 2017. Thank you for the help!

[@KartingApexKing]

Better explained than the majority of instructors...

[@georgiagourmet]

That made sense. Thank you for putting your knowledge out here for others to use!!

[@MissWooHoo11]

do one on sampling distribution!!

[@marzia3611]

Oh my god I have a final in a couple hours and I just understood what Z scores are thank you so so much

[@theresa2881]

Good video.We could use the table shaded to the left then find the complement of it for ease.

[@ppdruganda7]

Nice explanation to rely on for assignments about the z scores values

[@DrDdGoel]

awesome techniques of teaching, smoothly understood...thnx

[@champarai3853]

Great teaching with a concrete explanation ,,thak you so much

[@LeNguyen-im8dm]

It is very clear and easy understand, but it has so many steps

[@shijiessar145]

thank you sooo very much...finally a simple way to understand....thank u

[@simplisticguy1006]

Thank you so much mate, you are a god among men! haha thanks again for this upload.

[@frettlez2932]

This was a very clear explanation. Thanks alot!

[@cwatkins6098]

you did what my textbook couldn't!!

[@RobinOrzo]

+C Watkins Seriously! I'm sitting here reading my text book like wtf! This was so helpful!

[@rockygarewal3388]

Thanks, I thought him.

[@rockygarewal3388]

Thanks, I thought him.

[@sangeethamshare]

Why calculate area under (2) and (3), when we can find the answer by subtracting area under (1) from 100% ??

[@AllaahuAkbarr]

exactly I had the same thought in my mind..

[@artem911]

it was a mistake. If he was solving for the probability below 75 and above 60, then his method is correct.

[@dipakmasani5194]

Bye@@AllaahuAkbarr

[@thidalaythwe9535]

So clear to understand, thank you so much

[@LASUNQAZZEEM]

This is a cool presentation. You are a GREAT teacher

[@3511kat]

Thanks for clearing my confusion about z-score. This tutorial helps me a lot. :)

[@Tyokok]

great video! thanks! where is the link for t score or t test?

[@valeriadavis3112]

Wow!!! U are amazing! Thanks for breaking this down!

[@KevTheEntity]

thanks bro, helped a lot... wish u were my teacher

[@LinnSpin]

So grateful for this video. Thank you!

[@drummeragy]

You are amazing. Thanks for helping me study.

[@hanna0807]

This video is very helpful. Thank you! : )

[@2262sandeep]

Mnay Thanks for this great video ! Superb !

[@hhyyatt]

better than my textbook. Thanks!

[@shinigamikiro]

Thank you so much! I feel dumb for not understanding it sooner haha

[@hanial-dubayan1643]

you are doing well bro. please keep up the good work. ;).

[@lisalloyd1448]

thanks!!! Finally I understand what the table means.

[@Snitzler4710]

Excellent example! Thank you

[@drnykterstein_]

this channel is awesome

[@hannah-rayneplummer277]

Great video! Thank you very much! I finally understand! :D

[@bonny4827]

Thank you! Very helpful😃

[@TurnerTBone]

Thanks - very clear explaination!

[@charlesoloolumbwa481]

Thanks for the explanation...so comprehensive

[@tianzhong3149]

I TOOK A NAP IN CLASS THANkS FOR SAVING MY LIFE

[@ubaidshah1910]

Pinku lmao

[@Sam2260my]

Thank you ! Can you include in this video how to find z scores with the Calculator eg TI- 84 please.

[@jaimeupegui5855]

LoL! just find the z score and subtract that number from 1 and multiply by 100! (z score is .0668) so, 1-.0668=.9332 x 100= 93.32%

[@rishib333]

Thankyou. THANKYOU

[@dikeshdk6904]

Nice video clear and simple presentation , I don't why you got less views may be your title is not appealing to the first viewrs

[@mr.whiteboarder6311]

Great job, very clear.

[@raeraeyes]

thank you!!! helped me for my finals hehe

[@unknown-rf3yg]

Thanks a lot ..helped me a lot to begin with ..

[@shreyasingh640]

Thanks it helped me!!☺️

[@faerys_wheel6529]

Thanks so much! A great help.

[@diketsomatlou675]

Dude, you good fam!... Salute!

[@isateq]

wow you're awesome ! thank you so your amazing incredible teaching !

[@rockygarewal3388]

Thanks, I thought him.

[@dipakmasani5194]

TV in

[@researchaccount9691]

Thank you so much. Very helpful!!!

[@jessea.5185]

Thanks for these videos!

[@Leonx818]

Thanks for the great explanation.

[@Bsnap]

Tremendous help, thank you!

[@thejohnarnett]

thanks for making an excellent video! :D God bless ya :)

[@911alps]

A very good video thanks much appreciated

[@sunstrength8]

Brilliant!!! Finally understood :)

[@victoriabielomaz]

Thanks for the explanation!

[@xilefkruip]

Can we all fund for a better mic for him?! thanks for the good explanation buddy! :)

[@janetmejia7341]

Love it ! i finally understand it !

[@harjotsinghsaini1085]

Thanku so much :) it was very helpful

[@thewall07]

Thank you, you're so helpful

[@SolaceMusicTV]

Great Video!

[@johnkirchner5373]

Could have just subtracted 0.0668 from 100 and shaved off 5 minutes.

[@munaqer33]

+John Kirchner 6.68*

[@elizagcg6201]

I thought the d=same

[@abhranildas4807]

Thnaks for the Great Explanation

[@mathewsmolekana7185]

you enlightened me, thank you!

[@JoseLopez-eo4ze]

You don't need to know what section 2 is. If you know under -1.5 is 6.68% and that's 60 points, then your probability is everything above -1.5 or the "other side" which is the remainder - 93.32% which together is 100% It's a good exercise but burns time on the test.

[@h1g3k1]

Thank you, Gracias, ありがとう, Merci, Danke :D

[@terahgibson6853]

I am just wondering...If you know that the area under a normal bell curve = 100 and you have calculated the area of section one, why can't you just subtract section 1 from 100? It gives you the same answer as what you got with less work.

[@munyimarv5493]

am actually learning 👏👏👏👏

[@angelac2757]

Very helpful, thank you!

[@foodidecorifashionlfun2104]

Your Amazing👌

[@samcha1718]

How do we get the areas how do we compute them are they fixed? I'm at 8:43. Sorry for the question I'm not really good at stats.

[@eid2290]

The Area is 100%, he got 6.68 as the area below that.. so logically 100 - 6.68 is the 93.32

[@samcha1718]

Eid thanks for answering. I realized that there is a z table.

[@teenashaw3771]

Demetria Samantha z

[@prachis6785]

Very nicely explained

[@pauljohnong5924]

This is a lot simpler than I remember...

[@MrPabloguida]

Why in another video of your you say that z scaore is the Xbar - population mean divided by population or sample standard deviation divided by the square root of sample size?