A-Level Maths: L3-11 [Data: Introducing the Variance and Standard Deviation]

[realnoscope]

The sheer dedication that must've gone into covering the ENTIRE A-Level Maths/Further Maths syllabus is incomprehensible to us mere mortals. You, sir, are a legend.

[thecloudpai]

this video... amazing. never understood what standard deviation actually was until now. 😁

[ShezzaBeatz]

you’re literally saving my A level maths

[rohanverma]

Like that he turned a meaningless formula into something meaningful and easy to understand

[CamHarrisVlogs]

It's my last A Level Maths test on Monday and I couldn't have done it without you Jack! Thanks for everything

[Evie-xuxv]

Such a helpful video, need more teachers like this

[iSuperMC]

Thank you sir - you have no idea how much you’ve helped me

[Teeps]

Thanks so much. I was wondering why I was getting a different standard deviation in all my OCR MEI B questions. Now I know they are referring to the sample standard deviation!

[BA-bped]

I'm watching your videos to learn how to teach my students.

[alsoarmani]

I wish you were my teacher. I don't know what my teacher was teaching, and why he was teaching these FANCY TERMS; well, now I understand. All credit goes to you sir, my humble wishes for this fruitful channel of yours!

[hopestreet]

I know variance is important in statistics, but I currently only understand it as an intermediate step on the way to calculating the standard deviation. Are there occasions where variance is preferable?
Thank you so much for this video :)

[elo.s]

You explained this so well thank you so much

[poyo]

great video, I honestly wish my teacher just followed what this video did because I get it now and I didn't when he covered it

[ta_morrz]

Brilliantly explained, cheers Teach :)

[SomeoneSomething-zfcq]

Thank you so much it makes sense! It's crystal clear!

[misan]

What would a higher standard deviation mean? Can you please explain this to me?

[harrysmith]

Why do you square root after adding the x-x(bar) s together instead of before? Thanks for the great video also.

[bridgetezekiel]

You are you life saver truly thank you very much

[lukeollerhead]

Thanks :) Quick question - theres an Edexcel past paper question which refers to Sxy. It looks like it is in reference to correlation between two data sets. Basically it asks to find the PMCC between two datasets and provides Sxx, Syy and Sxy. This is not in my textbook :/

[jasonjebaraj]

Why do we square root n as well as Sxx? I understand square rooting Sxx but not quite sure why we square root n.