GCSE Revision Video 31 - Stratified Sampling

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  • Опубліковано 23 гру 2024

КОМЕНТАРІ • 60

  • @rockinglskater
    @rockinglskater 10 років тому +16

    Hello,
    I wanted to thank you for all your videos.
    They've helped me a lot this year, and I bet they will continue to do so.
    They have been extremely helpful. I'm sure I can pass my exams after watching so many of them! Thank you a lot!

    • @HEGARTYMATHS
      @HEGARTYMATHS  10 років тому +9

      Dear rockinglskater Thanks so much for your feedback. Im really happy to help. Try signing up to my free website with loads more help at www.hegartymaths.com/ Best wishes and keep up your hard work - it WILL pay off. Mr H

    • @HEGARTYMATHS
      @HEGARTYMATHS  9 років тому +2

      rockinglskater Hiya - thanks loads!!! Any chance you could spare 30 secs to vote for HegartyMaths in this Richard Branson competition which ends in a few days. Would mean a lot to me and HegartyMaths. www.virginmediabusiness.co.uk/pitch-to-rich/start-up/hegartymaths/ Thanks Mr H

    • @HarryR545
      @HarryR545 7 років тому +3

      that awkward moment when the creator of the video accidentally replies twice

    • @Doodo981
      @Doodo981 5 років тому

      HEGARTYMATHS will you be doing any A level maths videos?

    • @Messifuty.10
      @Messifuty.10 Рік тому

      33

  • @---vw9pl
    @---vw9pl 8 років тому +26

    it cracked me up when you said " it's a nasty decimal"

    • @sknn
      @sknn 5 років тому +1

      funny guy

  • @AFGAMINGOFFICIAL
    @AFGAMINGOFFICIAL 9 років тому +2

    The best maths UA-cam channel!

  • @salimuddin9884
    @salimuddin9884 10 років тому +1

    Honestly the best video on stratified sampling I have ever watched

    • @HEGARTYMATHS
      @HEGARTYMATHS  9 років тому

      Salim uddin Hiya Salim- thanks loads!!! Any chance you could spare 30 secs to vote for HegartyMaths in this Richard Branson competition which ends in a few days. Would mean a lot to me and HegartyMaths. www.virginmediabusiness.co.uk/pitch-to-rich/start-up/hegartymaths/ Thanks Mr H

  • @alicecheese7130
    @alicecheese7130 8 років тому +4

    i love you, thank you soo much i was stressing but you seem to have everything im looking for.

  • @janakudlackovaa
    @janakudlackovaa 7 років тому +1

    Thank you so much for all your videos. Shame I did not know about them earlier. A bit too late to be revising now but it is still helping me a lot :) Thank you!!!

  • @lukenguyenkilleen949
    @lukenguyenkilleen949 9 років тому +2

    Thankyou for this! This was a brand new topic in our year 10 class today and the past questions helped a lot, thanks! :)

  • @sarahrooney2786
    @sarahrooney2786 9 років тому +2

    Thank-you so much! Have my GCSE tomorrow & only discovering your account now, so helpful :-)

    • @HEGARTYMATHS
      @HEGARTYMATHS  9 років тому +3

      Sarah Rooney You are so welcome Sarah - I wish you all the best for tomorrow. Best wishes and keep working hard. Mr H

    • @mariamhussain3145
      @mariamhussain3145 8 років тому

      so did you pass

  • @rihanakhan9147
    @rihanakhan9147 9 років тому +1

    Thank you so much, this video was so useful. I am really glad i discovered your account ;)

  • @maeo1630
    @maeo1630 7 років тому +1

    Thank you for this video because I find it difficult to differentiate in question s like this. E.g. is it the histogram that I apply a mid-point if asking for the mean, do I need to add an extra column?

  • @zerpszerpy5431
    @zerpszerpy5431 10 років тому +3

    Thanks so much you taught me so much and I'm now confident and looking forward to my maths exam

    • @HEGARTYMATHS
      @HEGARTYMATHS  9 років тому +2

      Zerps Zerpy Hiya Zerps- thanks loads!!! Any chance you could spare 30 secs to vote for HegartyMaths in this Richard Branson competition which ends in a few days. Would mean a lot to me and HegartyMaths. www.virginmediabusiness.co.uk/pitch-to-rich/start-up/hegartymaths/ Thanks Mr H

  • @louisebarrah5827
    @louisebarrah5827 9 років тому +2

    this just saved my life thank you so much

  • @maeo1630
    @maeo1630 7 років тому

    just worked through this video. Thanks so much. completely understand it better.

  • @iazahussainzz
    @iazahussainzz 8 років тому

    what board is this? I'm with aqa and they don't ask the definition of samples

  • @georgehenna
    @georgehenna 8 років тому

    Is the sampling fraction and sampling scale factor the same?
    Thanks:)

  • @maeo1630
    @maeo1630 7 років тому

    hi there! (sigh)
    I didn't do well in my non-calc. can I make up for it in the calculation do you think?

  • @roxanamaria601
    @roxanamaria601 8 років тому +1

    If i actually pass my maths gcse it will be because of you, thank you!

  • @israahmed6720
    @israahmed6720 8 років тому +1

    Is this on the 2017 GCSE?

  • @Brando-gy1zx
    @Brando-gy1zx 5 років тому

    Are u the guy from the Ukulele Teacher???

  • @mrsagathahudson5227
    @mrsagathahudson5227 5 років тому +1

    It amazes me that the examiners only gave 3 marks and thus 3 minutes to do that question.

  • @joseph_0185
    @joseph_0185 5 років тому +1

    what happened at 5:23
    like if you saw it

  • @user-vx1tr4df4d
    @user-vx1tr4df4d 9 років тому

    It says by year group.. So wouldn't it be 1140/500

  • @emmanueljafet9516
    @emmanueljafet9516 9 років тому

    Do a video on calculating stratified sampling in survey work. Some questions in that topic include: Calculating the estimator of standard division, placing a bound on error of estimation, calculating population proportion and stuff like that. Because I'm doing these things in uni and I don't get them and no one on youtube has done any of them

  • @ritanorris8036
    @ritanorris8036 10 років тому +2

    Thank you SO much!!!!!!

    • @HEGARTYMATHS
      @HEGARTYMATHS  9 років тому +2

      Rita Norris Hiya Rita- thanks loads!!! Any chance you could spare 30 secs to vote for HegartyMaths in this Richard Branson competition which ends in a few days. Would mean a lot to me and HegartyMaths. www.virginmediabusiness.co.uk/pitch-to-rich/start-up/hegartymaths/ Thanks Mr H

  • @jess.vernon9534
    @jess.vernon9534 8 років тому +5

    Maths statistics GCSE tomorrow noooooooo

  • @ChsonlineOrgUkinternetschool
    @ChsonlineOrgUkinternetschool 5 років тому

    Good work

  • @mozelchowdhurry8451
    @mozelchowdhurry8451 8 років тому +1

    Sir I have watched all of your videos and I don know why but I am finding this topic very difficult to get it in my brain. I dont quite get it.

    • @user-ry2sb6iw1l
      @user-ry2sb6iw1l 8 років тому

      +THEANCOR So basically there's a sample of population someone wants to investigate
      firstly add the total population of the data, then divide the total by sample.
      now depending on what question you got, you have to either X or divide the answer by "number of" what the question is investigating

  • @PLUMY147
    @PLUMY147 10 років тому +1

    Great vid :D

    • @HEGARTYMATHS
      @HEGARTYMATHS  9 років тому +2

      Mr Chokshi Hiya - thanks loads!!! Any chance you could spare 30 secs to vote for HegartyMaths in this Richard Branson competition which ends in a few days. Would mean a lot to me and HegartyMaths. www.virginmediabusiness.co.uk/pitch-to-rich/start-up/hegartymaths/ Thanks Mr H

  • @franzellelevida5766
    @franzellelevida5766 9 років тому

    ohh, thank goodness i found your video... i have a quiz next meeting about this... thank you so much!!! this video helped a lot.. to me :)

  • @martincampbell9097
    @martincampbell9097 8 років тому

    surely the more logical way would be to express each group as a fraction of the population, and then just multiply it by the sample size. Isn't that more intuitive?

  • @jaimoljohn4319
    @jaimoljohn4319 6 років тому

    Helped a lot

  • @davidhill8163
    @davidhill8163 4 роки тому

    many thanks

  • @scarydudesammy
    @scarydudesammy 7 років тому

    quite funny when he was like, "random sampling is the......................... actualy it would be better to write it like this..." xD, but a good video, thanks very much

  • @mariekeane4482
    @mariekeane4482 8 років тому

    Really helpful, thank you

  • @alexs1195
    @alexs1195 9 років тому

    total number of students in yr 9 divided by total population x by 100 also works

  • @jacquelineflynt8491
    @jacquelineflynt8491 7 років тому

    don't you mean.....for esample

  • @MsJanjoon
    @MsJanjoon 7 років тому

    I dont get Ex.2 . the answer that im getting is 1

  • @iazahussainzz
    @iazahussainzz 8 років тому

    what board is this? I'm with aqa and they don't ask the definition of samples