How to find the variance and standard deviation from a set of data

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  • Опубліковано 23 січ 2025

КОМЕНТАРІ • 333

  • @eian2k601
    @eian2k601 4 роки тому +990

    When you realize you can learn and learn a whole semester semester of math in a day of watching UA-cam.

    • @crunchysoup8515
      @crunchysoup8515 4 роки тому +62

      i learn more here than the 30 minutes in class

    • @sizuchii
      @sizuchii 4 роки тому +15

      true. i understand lessons here than my own math teacher discussing idk words in front of the class.

    • @ygmsniper
      @ygmsniper 3 роки тому +1

      You are absolutely right.

    • @thelordnaevis4946
      @thelordnaevis4946 3 роки тому +4

      Had summer class because of this. Was still confused in summer class. This helped. Then 2 weeks after summer class, I’m back in school. Which is bullshit.

    • @eenchantress5113
      @eenchantress5113 3 роки тому +3

      Try an hour before an exam

  • @thetravelingteacher4474
    @thetravelingteacher4474 4 роки тому +82

    Thanks to you I'm passing my online college statistics class!! The chart is a great idea !!!! Thank you!

  • @raymondsmith9886
    @raymondsmith9886 4 роки тому +91

    As always great. He actually explains the problem that's why he's a good professor!

  • @josiahcisneros2968
    @josiahcisneros2968 6 років тому +272

    Richard getting called out like that smh

  • @michellezulema9422
    @michellezulema9422 2 роки тому +24

    I learned all of this in just 8 minutes after it took me days to try to understand my statistics text book. Great videos !👏🏼👍🏼

  • @PolskaBabii
    @PolskaBabii Рік тому +11

    I have enrolled in Sophomore level (University) statistics, just to drop it, like 4 times, because I knew, before the midterm, that I was not going to be able to pass it. I finally did, with a C. Not my best work. I am an A/B student. Years later, I am back in school for a second degree, and I am having to re-take statistics because the statistics I have credit for is "statistics/business majors" and now I am a pre-nursing student, so they are making me take regular statistics (not for business majors), which I think is ridiculous, considering its the same material, same book, same chapters are covered, but I digress. I had a melt down when I found out I would have to take this class again, especially as it is the last class I have to take to enter nursing school. If I had access to these videos way back when, I could have passed statistics the first time, with an A. I have a A in my class now, and am breezing through, with EASE. This class used to keep me up at night, stressed beyond belief. I am actually enjoying it now. It amazes me, the difference it makes, when you have a GOOD teacher. I cannot thank you enough for your time and effort put into this channel. You have saved me from a guaranteed ulcer.

  • @kyleschwartz.
    @kyleschwartz. 5 років тому +45

    this dude is the GOAT

  • @CasualCrypt
    @CasualCrypt 5 років тому +209

    Richard, get back in your seat bro

  • @rachelturner5192
    @rachelturner5192 3 роки тому +16

    Taking college stats & your teaching is sooo helpful & I can actually understand the material. You are very passionate about statistics & it shows!
    Thanks:)

  • @adventurwithken412
    @adventurwithken412 4 роки тому +37

    Do you have a playlist for statistics? I will like to watch all your statistics videos please. Your teaching style is amazing. Thanks in advance

  • @jordanblair770
    @jordanblair770 4 місяці тому

    Man, I was so excited when I clicked on this video and saw you! I used your videos in high school and now I'm using them in college

  • @rajathalder3854
    @rajathalder3854 5 років тому +8

    love you sir, I am from india.
    your teaching style is so nice

  • @CAROLYNN14100
    @CAROLYNN14100 2 роки тому

    you are the best teachers on UA-cam that I have ever came across who solves problems step ny step

  • @Mrs.Thomas48
    @Mrs.Thomas48 2 роки тому +1

    When you wished that this guy could have been my math teacher when I was in school. Thanks for explaining everything so clearly. Getting ready to take my Math 4-8 certification exam -- I finally get it! Thank you!

  • @stevenayala-earayala3482
    @stevenayala-earayala3482 3 роки тому +5

    Thank you so much. You are an excellent teacher and glad this video is still around. I hope you have a whole lesson(s) on stats.

  • @adventurwithken412
    @adventurwithken412 4 роки тому +3

    Just wanted to say THANK YOU. You are a good teacher,

  • @shadysh8s
    @shadysh8s Рік тому +2

    I am so happy that John Fetterman teaches math :) Couldn't make it through school without you,

  • @dakotarhoades6924
    @dakotarhoades6924 7 місяців тому

    thank you so much for this video, I had missed this class and didn't know how to do it. with your explanation and visuals I learned it so fast as was able to finish my work all today. you are a god send

  • @ZeroTNitrous
    @ZeroTNitrous 3 роки тому +3

    this guy just gives off the perfect math teacher vibes, I can't explain it. thank you so much!! videos are always so helpful

  • @nikkiej.5875
    @nikkiej.5875 8 місяців тому

    I couldn’t remember how to find the variance so I had to watch a video to refresh my memory. This video was very concise. Thank you.

  • @KingTarmiel
    @KingTarmiel 3 роки тому +32

    When I spent my day reading books but learned nothing so I swallowed my pride and watched youtube

    • @randomguy8228
      @randomguy8228 3 роки тому +1

      Why would you need to swallow your pride lmfao

    • @KingTarmiel
      @KingTarmiel 3 роки тому +5

      @@randomguy8228 because I thought i don't need help. Simple as that LOL

  • @jovanmaefajardo
    @jovanmaefajardo Рік тому

    Maraming salamat po! ❤️ Today is our exam and it was so difficult for me because I'm not really into Math 😭 then finally i understand this way of solving than the examples in textbook. THANKYOU Prof!❤️

  • @gritworth805
    @gritworth805 6 років тому +20

    Omg, thank you soooooooooo much, you explain it very well!!!!

  • @robjones2265
    @robjones2265 Рік тому

    well this is the second time this channel has helped me with my college math work.

  • @zalrawi80
    @zalrawi80 4 роки тому +2

    Thank you so much for this valuable help. This video saved me in my master's program.

  • @destinylierman5395
    @destinylierman5395 4 роки тому +2

    Thank you so much for this video! If it wasn't for this video I would have struggled hard with my statistics test.

  • @abrahamhoskinsx4698
    @abrahamhoskinsx4698 7 років тому +8

    Thanks you are very good at explaining your steps and using new methods! Your awesome!

    • @brianmclogan
      @brianmclogan  7 років тому +1

      you are very welcome! happy to be able to help

    • @maden8154
      @maden8154 Рік тому

      I am confused I thought it was n-1 at bottom instead just 'n" for the variance. Like devide by n-1

  • @gabebarbieri194
    @gabebarbieri194 3 роки тому +10

    For the variance, isn't the summation of (xi-xbar) squared divided by n-1 rather than n?

    • @hmode1533
      @hmode1533 2 роки тому +4

      yes, that is why i am a bit confused.. i calculated it and devided 86.9 / 9 = 9.65 the variance, for standard deviation it is = 3.10

    • @jehnelagnesmandolado5348
      @jehnelagnesmandolado5348 Рік тому +3

      Maybe he got confused but it is supposed to be n-1

    • @SM.usmanedits
      @SM.usmanedits Місяць тому

      @@gabebarbieri194 You're right
      He may have forgotten to add -1

  • @jazzscott9850
    @jazzscott9850 4 роки тому +2

    I know this video is old but it just saved me I am horrible at math never really understood much in it but the way you did this step by step is easy terms was so helpful and helped me understand what I was actually doing and had to do so thank you!

  • @natashaplatt4623
    @natashaplatt4623 4 роки тому +5

    You are so brilliant! I have learned more from your videos than my actual classes and text books. Thank you so much!

  • @AmandaGabriel876
    @AmandaGabriel876 3 роки тому +1

    Good teacher👏🏽

  • @kei7803
    @kei7803 4 роки тому +6

    I got confused about the square root of 8.69=9.32, I thought my answer is wrong, thanks to the guy who noticed the answer. Anyways thank you, Mr. Brian, your videos are a big help to me.

  • @seriii2805
    @seriii2805 2 роки тому

    Thank youu! i finally undestand how to get the variance have a good day!

  • @felixhope-vu3jy
    @felixhope-vu3jy Рік тому

    U'r the best it's simple, understandable and helpful .🙏

  • @jessicacelineb.oliveros1439
    @jessicacelineb.oliveros1439 2 роки тому

    love u bro i believe that with the power of Mr bryan mclogan I can pass my statistics quiz today Amen thank you bro

  • @yanglu8838
    @yanglu8838 3 роки тому +1

    Wow, thank you so much for clarification of variances for me. I am currently finishing my masters degree and haven't take a statistics class. So this does explain the concept well. Thanks again!

  • @maroondragon5316
    @maroondragon5316 3 роки тому

    Thank you, I am in an online practical math class and this video is helping me!!

  • @falseking7197
    @falseking7197 Рік тому

    Been a fan of your channel for a long time now and you have helped me once again, thank you so much.

  • @curateitgorl
    @curateitgorl 2 роки тому

    Very thorough! Wished you were my previous stats prof. Explained well.

  • @brandisilva8911
    @brandisilva8911 Рік тому +1

    YOU are amazing!!! Do you have more videos?? You just taught me in 8 minutes what Ive been struggling to understand in one whole week.. Stats is my very last class standing between me and my BA and Ive been putting it off for a whole year bc every time I sit to do my homework, I cry.

  • @eledinaguarde3999
    @eledinaguarde3999 2 роки тому

    Thanks for sharing..it really helps..now that I am answering my assessment in statistics.

  • @WhereisNaz
    @WhereisNaz Рік тому

    WE LOVE MR MCLOGAN💯💯💯

  • @catirerubio
    @catirerubio 11 місяців тому +4

    I think the teacher uses n instead of -n as the divisor because the problem is for a population, not a sample of a population. That important point should be included in the lesson. The concept is difficult enough without explaining this crucial point.

  • @jennybee6610
    @jennybee6610 4 роки тому +3

    This is perfect! Just what I needed !! Thank you .

  • @jobekirkuk
    @jobekirkuk 2 роки тому

    I became one of your fans man!

  • @woolzem
    @woolzem Рік тому

    Thank you so much🎉❤ my math teacher is brilliant but I'm ADHD and sometimes I need things said a different way. I just aced my math question

    • @brianmclogan
      @brianmclogan  Рік тому

      I get it, so happy
      To be here for you!!

  • @attach2u
    @attach2u 4 роки тому

    thank you! taught me more than a powerpoint that my professor gave me!

  • @JuanCarlosBenavides-h7y
    @JuanCarlosBenavides-h7y 6 місяців тому

    very well explained thank you very much.

  • @yazenzei8894
    @yazenzei8894 3 роки тому +2

    the way he wrote 66 was amazing 2:09

  • @TheEPICOSITY143
    @TheEPICOSITY143 5 років тому +43

    Richard gettin called out LOOL

  • @phantomfreeman283
    @phantomfreeman283 4 роки тому +2

    Helpful 5 minutes before my algebra final.

  • @nicolehamilton8705
    @nicolehamilton8705 4 роки тому +3

    Thank you..this helped alot!

  • @kurt9722
    @kurt9722 5 років тому +22

    2:07 nice

  • @marcogush4376
    @marcogush4376 4 роки тому

    You are better than my prof.

  • @andrewlira1537
    @andrewlira1537 2 роки тому +4

    I was about to question why he got the incorrect SD, yet I was glad it was raised by the student lol

  • @kadedyanga01
    @kadedyanga01 3 роки тому

    Thank you for making me understand gracious

  • @liquiiiddd
    @liquiiiddd 3 роки тому

    This upload helped me a lot, thanks Brian!

  • @riovillanueva6787
    @riovillanueva6787 3 роки тому +2

    Hi Brian. Just tried this method solving variance for nos: 8,8,9,12
    ...and I got 2.68 for variance. Did I got the correct answer? Just checking if I did the right solution 😊😊😊

  • @desmondmccobby4457
    @desmondmccobby4457 3 роки тому

    i love your teaching sir

  • @maneetwalia2721
    @maneetwalia2721 4 роки тому +1

    I paused ur video and getting root wrong.. then i started ur video i got the same answer in the laste bcz u took wrong root by mistake.... Sir vry nice teaching method....👍👍👍

  • @alejandroresendez3498
    @alejandroresendez3498 3 роки тому

    thank you for teaching me

  • @Brickfilms4U2enjoy
    @Brickfilms4U2enjoy 4 місяці тому

    You got me through Algebra 2 and Stats

  • @1STEP_Channel
    @1STEP_Channel 4 роки тому +8

    You'ee a savior ◉‿◉ I learned more in 8 mintues than 1 sem hahahahahahahahahah

  • @lifewithstanya8742
    @lifewithstanya8742 4 роки тому

    This helped so much🙏🏾🙏🏾Thanks!

  • @Mr.Burgess843
    @Mr.Burgess843 2 роки тому

    This guy is a legend!

  • @ravendell3015
    @ravendell3015 4 роки тому +1

    Thank you, very helpful

  • @Mia-cf9kj
    @Mia-cf9kj 3 роки тому +4

    Math is easier if it is taught by a good teacher

  • @aamirabdulsalam
    @aamirabdulsalam 3 роки тому

    MR BRIAN I LIKE YOU FROM PAKISTAN, YOU ARE ALWAYS HELPFUL TO ME

  • @johnyepowamulolo5489
    @johnyepowamulolo5489 5 років тому +43

    It should divided by n-1

    • @stephaniesepko6843
      @stephaniesepko6843 5 років тому +1

      yeah youre right. I went to go put the answer in mhy Homework and it told me n-1 and also 8.69 divided by 10 is 0.869

    • @raspberryzpower
      @raspberryzpower 5 років тому

      @@stephaniesepko6843 it's 86.9/10, not 8.69. 8.69 is the variance.

    • @mariamasannymohammed16
      @mariamasannymohammed16 4 роки тому

      Yh u are correct

    • @user-wj8dh3cg4w
      @user-wj8dh3cg4w 4 роки тому +4

      That’s only for a sample variance, he’s doing a population variance, he’s very correct

    • @mursaleenakhtar970
      @mursaleenakhtar970 4 роки тому +25

      He is right because he is dealing with total population which is n=10 and we use n-1 where we are drawing sample from the population. For more brief lets take as example
      If we want to measure height of one class of 15 students and we are taking all the students so it means we are taking whole population (Class of 15 students). Here we use 'n' not 'n-1'.
      If we want to measure height of one all students in a university which are 1500 students and we are taking only 15 students so it means we are taking sample from whole population. Here we use 'n-1' not 'n'.
      Hope explanation will assist you.

  • @Renostat_
    @Renostat_ 7 місяців тому

    i’m so bad at math that i cry over it and i’m going to have to use this whole table method to actually be able to do this thanks for making it easier

  • @charlottbadza1953
    @charlottbadza1953 4 роки тому +1

    You have made my life easy, thank you

  • @duffinthemuffin5792
    @duffinthemuffin5792 4 роки тому +3

    I know I'm very late to the party just reviewing standard deviation what exactly did you do at 6:46 I didnt quite catch that

  • @melissamarquez5517
    @melissamarquez5517 5 років тому +2

    Thank You!

  • @shakirhassan6027
    @shakirhassan6027 4 роки тому

    awwsome teaching method.....thankuuu sir

  • @alfalyn
    @alfalyn 3 роки тому

    THANKYOU Sir 🙌

  • @janethtorres07
    @janethtorres07 3 роки тому +23

    omgg i was so confused at the end and kept going back just to find out 30 min later it was wrong😭

    • @jaidendavila7701
      @jaidendavila7701 3 роки тому

      Litterally 🤣 i was sitting there like.... 🤨 wayment

    • @renzandrewdelacruz7666
      @renzandrewdelacruz7666 3 роки тому

      Hahahha ify

    • @roycejazontesorero9097
      @roycejazontesorero9097 3 роки тому +1

      IKRRRRRRRRRRRRR

    • @ygmsniper
      @ygmsniper 3 роки тому +1

      I was about to go back at the previous minutes of the video, but decided to just finish the whole lesson. Thank goodness it was corrected just a few seconds later.

  • @TheJessaMattson
    @TheJessaMattson 2 роки тому

    Thank you so much for uploading this!

  • @lerrysteven9231
    @lerrysteven9231 3 роки тому +1

    Thanks

  • @hasikarunanayaka9683
    @hasikarunanayaka9683 3 роки тому

    Thank you sir ❤️

  • @taybro893
    @taybro893 3 роки тому

    Thank you

  • @eugenaharley7103
    @eugenaharley7103 4 роки тому +1

    Thank you!!!

  • @DrPanda-kf8cu
    @DrPanda-kf8cu 5 місяців тому

    IM SUBSCRIBING NOW lol you are awsome, taking online statistics in college and its almost entirely self taught and the presentation videos are all from like the 80s wanting to use the TI 89 calculator ? or whatever its called lol didn't show me jack on how to do this and the text book barely explains it.. I swear they keep adding in new technology so the teachers have to do as little work as possible.. i actually hate talking face to face but the longer I do online schooling the more I just wanna call up my teacher lol... anyways love the video thanks a bunch

  • @theresejarquio7039
    @theresejarquio7039 4 роки тому +1

    a great help, thanks!

  • @kharenvallesteros1934
    @kharenvallesteros1934 3 роки тому

    thanks sir...🥰

  • @래모루래모로
    @래모루래모로 2 роки тому

    Thanks you so much

  • @97map
    @97map 3 роки тому

    thank you.. very descriprive

  • @daniyatennant1574
    @daniyatennant1574 Рік тому +1

    When do you use n-1 for variance to divide? Bc I divided by n for my work, but my teacher told me dividing by n-1 is the correct way to solve

    • @mssaxon85
      @mssaxon85 Рік тому

      This is what I am confused about now did you ever figure out the proper way

    • @sellahyekha4349
      @sellahyekha4349 Рік тому +3

      For sample values you use n-1 and n for population values

    • @bryanwilson4695
      @bryanwilson4695 Рік тому

      w reply@@sellahyekha4349

    • @DarkPrincess_M
      @DarkPrincess_M 7 місяців тому

      How am I supposed to know if it's a population or sample?

  • @teedee1167
    @teedee1167 5 років тому +1

    good example. thanks

  • @ganeshcshet2537
    @ganeshcshet2537 Рік тому

    Thank you sir

  • @alexis5784
    @alexis5784 4 роки тому

    Super helpful, thanks!

  • @anabelambriz3251
    @anabelambriz3251 5 років тому +2

    thank you!

  • @necholsmangubat2108
    @necholsmangubat2108 3 роки тому

    Thank you so much for this!

  • @obsidian-eye
    @obsidian-eye 2 роки тому +1

    Can't believe an hour and a half of STATS class and I was still so loss, just for an 8 minute video to make me understand lmao.

  • @cjwilliams5195
    @cjwilliams5195 Рік тому

    freaking Nathan man, guy cracks me up

  • @Sirjacome48
    @Sirjacome48 5 років тому +1

    thank you so much for the help!

  • @josielaure8987
    @josielaure8987 4 роки тому +7

    This was useful but the for the standard deviations it n-1 and not just n

    • @R_shah
      @R_shah 3 роки тому +2

      Thats for sample variation s²

  • @that_girlbob
    @that_girlbob 4 роки тому +4

    Can you explain why the MEAN is 66.1 and not 66? Where did the .1 come from? Thank you

    • @connorclark3325
      @connorclark3325 Рік тому

      I'm sure you know now as this is 3 years old but the mean is average and I'm pretty sure you were thinking of median

  • @AbdUllah-qv4dk
    @AbdUllah-qv4dk 4 роки тому

    Wow ❤️ amazing sir

  • @gssaan5871
    @gssaan5871 2 місяці тому

    Thanks you I have exam tomorrow ❤

  • @mathhelpmadeeasy
    @mathhelpmadeeasy 2 роки тому

    Thank you so much for the wonderful content!