Statistics: Variance of a Population

Variance of a population.

Category:

Education

Tags:

• statistics
• variance
• standard
• deviation
• population
• CC_6_SP_3
• CC_6_SP_5_c
• CC_7_SP_1

[ckulis]

You Saved my Life. I pay $2,000 for summer classes and $200 for a text book and at the end of the day this is the only way i learned this stuff. Thank you.

[beto1glez]

YOU ARE MY HERO!!!!

[10bengy]

I think that these lectures should be arranged in sequences because, it is easy for someone to lose track of what the next lecture is going to be.

[SuperNation22]

this is amazing how do you profession in area of academics? really everything i watch from you is as though you master in that part alone 

[k1koth3gre4t]

@ckulis you must be american

[ydym30]

You do have a way for teaching. Thx.

[Kurgipurk]

At this point, its 3am. I'm kinda sleepy, but not sleepy enough to get off of youtube. I find this so fun to learn that i got my notebook out and started writing this stuff down. Talk about an excellent teacher... :P

[JackAttack363]

Said 4 wrote 3. DOH! >.<

[x3triLogyx3]

you are absolutely amazing.

[xbuchtak]

@josenros

I'm sure this sounds a little bit confusing, just watch more Sal's videos or look the details up on wikipedia. It'll come together ;-)

[xbuchtak]

@josenros

I'm no mathematician, but I think it's because the properties of the sum-of-the-squares function, the sum-of-abs-dif func is non-linear, causing some problems not to have closed formula solution. Actually the formula for sample variance sum((xi-mean)^2)/n can be derived as a maximum likelihood estimation of population var., meaning that the calculated value is "most likely" close to the correct value under the assumption that the numbers xi follow the Gaussian distribution.