How to Calculate Standard Deviation and Variance by Hand

In this video, we'll learn the steps to calculate the four main measures of variability by hand: sample variance, sample standard deviation, population variance, and population standard deviation. Doing so will also require us to find the sums of squares (SS), which we'll also discuss.

[donnaspenader]

I have been trying to learn this for weeks and until I stumbled across your video, I could not understand it so I can’t thank you enough I’ll look forward to more of your videos. Thank you again again.

[E.M]

Thank you so much. Paying 40k in tuition to learn from a 9-minute YouTube is crazy. You saved me!!

[marianacosio]

Although statics still gives me a headache, I have to say I have no clue what I would have done if I didn't find your channel! Thank you SO much for explaining everything as simple as you can!!!!

[priakaushal]

i've never has stats so easy. finally i understood why we did what we did. my teachers made it sound so darb and boring without the logic. een though you didnt get into it a lot, you made it clear as water. thank you so much. youre a great teacher. in india we call a teacher Guru, ergo, dhanyawadam guru ji. (thank you, dear teacher).

[GSMonkey]

Never learned about standard deviation before, but need it for a report i am making, and after your 2 videos, i feel i already have a pretty good understanding of it and know how to use it practically. So big thanks from me :)

[Chester-nxxc]

I think I would be hanging in your channel for the next four years, Professor. I am taking a BS in Psychology, and I will be looking forward for more concise lectures. :))

[Azminsonu]

You are the best thanks for your brief explanations life saver!! Literrally better than my professor ❤

[francesemminuto]

I had some statistics class in my life, but I never understood these basics so good. Thank you!

[Sandylaraaaa]

Thank you Daniel!! You explain it so well and make it easy to understand 🙌🏽

[ahmedfathy]

you are fabulous in illustrating information

[ayasosseyalaoui]

Thank you very much for these good explanations🙏. It was very helpful

[hipolitonovido]

I love your videos. How i wish i found it when I'm still studying

[anikenejoseph]

this is beautiful. well explained and simple to follow

[TheIresh]

Very good lesson. Please do more lessons like this. Thank you!

[curiousmonkey]

Why are we subtracting 1 from N? Why guesstimate it in that direction instead of +1 for example?

Thank you very much for teaching us! <3

[journeyto...]

Hi, a really great video about statistics ...I can't understand how just by putting (n-1) will approximate the sample to population SD or Variance ...plz tell

[ilsabyrd]

If you have multiple rows of data (two rows of Cups data instead of one) would the population variance use the sum of squares for all data together?

[curiousmonkey]

Could u link to something (or give keywords to search with) that explains why is it better to square than use the absolute value to get rid of the negative? ^^

[iqraqadeer]

finally i understand the terms. thank u so much

[kmoody]

When you got 22.4, why didn’t you subtract from x bar (2.6)? Was that not needed?