Official ECMT 1010 thread. (1 Viewer)

[sarevok]

Where'd you see the formula? Can't find it anywehre.

 

[04er]

from the word document, 'Joint_Distribution', pg. 12, Week 5 Lecture Notes.

 

[04er]

Just in case someone's missing the document I've uploaded it

 

[jpr333]

I'm pretty sure that's standard deviation of x * standard deviation of y

 

[04er]

I'm pretty sure that's standard deviation of x * standard deviation of y

that's what i assumed, so i tried finding Sx and Sy thru Std Dev but the value is completely off to what they got.... help

 

[jpr333]

Checking my notes it is SD, just make sure you root the answer cause the equation E(X^2) - [E(X)]^2 is = variance or standard deviation^2.

 

[04er]

Checking my notes it is SD, just make sure you root the answer cause the equation E(X^2) - [E(X)]^2 is = variance or standard deviation^2.

ok thanks for that... i'll try it again but later in the day... right now I'm preparing for the second econ quiz... woopeedoo

 

[s.m.i.t.h]

when are the goddam notes for this weeks ecmt lectures gonna be put up?

 

[absolution*]

Does anyone have the notes for CLT. I have no idea what it is because i didnt go to the lecture and its not in the textbook. Help me.
Please.

 

[ToO LaZy ^*]

hmm..bored doesnt seem to let me upload the notes.
sorry mr absolution sir.
can't help ya

 

[absolution*]

dying_atheist@hotmail.com

cmon, you know you wanna...

 

[ToO LaZy ^*]

prepared to get bombed with fetish pRonz.

EDIT: added
EDIT EDIT: ...to subsciptions

 

[absolution*]

prepared to get bombed with fetish pRonz.

Dude, what else would you assume my inbox to full of already? There aint nothing hotter than midget-interracial-huge boobs-albino-milf pr0nz.

 

[ToO LaZy ^*]

check your junk mail dutette.

 

[absolution*]

thanks big boy

i have a qu.

With say... Var(4X-Y+3)

where varx=4 and vary=5 covxy=12

it would be 16(16) + (1)(25) + 12(4)(-1) = etc...

why is it that the varx and vary are squared?

according to the formula id assume it should be:

16(4) + (-1)(5) + 12(4)(-1) = etc... as you dont square the varx and vary's.

 

[ToO LaZy ^*]

it should be 16(4) + 1(5) - 2(4)(-1)(12)

 

[absolution*]

heh, i suck at maths

but in the quiz 2 example you and lainee were squaring the varx and vary???

 

[ToO LaZy ^*]

we were given the standard deviation you silly billy

 

[absolution*]

right so if you get stdev symbol (subscript) x that needs to be squared when you use it in that equation?

 

[ToO LaZy ^*]

that is correct