Question 1)
I have X and Y independent stoch. variables
What is E[X^2 * Y | X] ?
does it generally hold that if X and Y are independent, then every function of X (eg X^2) is independent of Y?
Does E[X^2 * Y | X] then become E[X^2|X]*E[Y|X] = E[X^2|X]*E[Y] since X^2 is independent of...
Hi,
I'm in a college statistics course where I'm doing an assignement with Minitab.
I have a one month time series of electricity use (hour intervals).
I've attempted to remove the season effect from weekdays by index multiplication so all I'm left with (hopefully) is the effect from...
tiny-tim, Thank you, I found a guide on Wikipedia that proved very helpful.
HallsofIvy: Then I obviously didn't know long division, I didn't know you could use that to figure out the decimal value of the remainder. Your explanation helped.
Thanks
I'm working on moving away from long time slavery to the calculator
Most forms of division and multiplication is going well now (long division and in some instances lattice multiplication)
One thing I DON'T get though (and can't find any guides for) is dividing remainders.
For example...
I have (from a complex equation problem) found the following angles in the answers:
5PI/8, 9PI/8, 13PI/8, 17PI/8
In the same assignement I found sin(PI/8) = .5*sqrt(2-sqrt(2)) and I found the cos(PI/8) value by using standard trig. identities.
Is there an easy way to use this result to...
Ok, so I have two questions regarding something I don't understand in my textbook (Adams)
1.
0 if 0<=x<1 or 1<x<=2
f(x) = 1 if x=1
(by "<=" i mean less than or equal)
I'm supposed to show that it is Riemann integrable on that interval.
They chose P to be: {0, 1-e/3...
Oh, but I didn't think I could do that when y*x^2 was encapsulated by parantheses.
When I solve what you posted I get y=tan^-1(x) but the answer is supposed to be:
(pi/4)(1/x^2)-(1/x)-tan^-1(x)/x^2
(the pi/4 comes from the start value...)
Oh, dear god... I can't believe I could be THAT silly :bugeye:
Of course I see it, my incredible dull brain was confused by the n's, probably.
Anyways, sorry for bothering you with this. That was rather embarrassing...
So im supposed to find the distance from the moon where the force on a particle from the earth and sun is equal.
I get this expression (earth-moon distance is 400 000km):
yMm/(r^2) = yMm / (400000km-r)^2
But from that I get r=200 000km and the answer should be 40 000km...
whats wrong...
Ok, thanks. I have that one now.
Can you please hint me with one more:
I have the integral of (sqrt(1-x^2)) / x^4 dx
Which with trig.subs leads to:
integral of cot^2(y) *csc^2(y) dy
Again I'm stuck :P