Please post any and all homework or other textbookstyle problems in one of the Homework & Coursework Questions...

Feb2313 09:25 AM
micromass

1 
27,629 
As title:
How do you relate P(F) with P(F') where F' is F's closure.
Conditions: P(F)\neq 0 and F nonempty.
...

Mar1911 07:10 AM
rukawakaede

3 
1,089 
At time 3:50 through 4:35 in this  http://www.youtube.com/watch?v=0Xm10qDxU9s  video, I think there should be...

Mar1811 05:01 PM
Kokone

0 
854 
I read this article about non central chi square distribution...

Mar1811 04:29 PM
Stephen Tashi

5 
3,215 
So if I want to prove. A=>B for all x.
Does the following work?
Suppose for contradiction, B is not true for...

Mar1811 02:22 AM
Stephen Tashi

2 
1,268 
Wasn't sure of where the most appropriate place would be for this post.
If you have a truth table, say for...

Mar1811 02:10 AM
Stephen Tashi

1 
933 
I have a challenge for all y'all: Go out and do some research on the chances of winning a "Minute To Win It"...

Mar1711 08:16 PM
moonman239

0 
1,593 
Hi,
Just curious as to what is the basis of the margin of error given in polls, e.g.,
in statements of the...

Mar1711 03:34 PM
mathman

9 
2,684 
Have a question that I'm having some difficulties with, wondering if I'm on the right track:
A machine has a 0.9...

Mar1711 09:13 AM
anjunabeats

0 
835 
I never understand the difference between 'Equally Likely Events', 'Mutually Exclusive Events' and 'Exhaustive...

Mar1711 07:20 AM
Bacle

11 
2,346 
Reworded version:
I think I need to reword as follow:
Can a nonempty set X with P(X)=0?
Suppose F to be a...

Mar1711 05:08 AM
rukawakaede

5 
1,534 
So on a different forum I go to someone said something about flipping a coin 1 million times, and that the probability...

Mar1611 05:45 PM
HallsofIvy

8 
1,798 
Hello to all.
Simple question but I'm getting the wrong answer here.
Question:
The random variable X is...

Mar1611 09:26 AM
SolCon

2 
1,493 
Reference: http://en.wikipedia.org/wiki/Bijection,_injection_and_surjection
Consider the two sets X & Y connected...

Mar1511 12:47 PM
sponsoredwalk

5 
1,121 
Hi all,
What is a good way to use replication methods for estimation? For a dataset with no design information,...

Mar1511 10:33 AM
zli034

2 
834 
If there exists a realvalued measurable cardinal, then there is a countably additive extension of Lebesgue measure to...

Mar1511 02:18 AM
nomadreid

2 
1,906 
Hey there!
Is there any formula to determine the power of a cardinal number to another cardinal number?
...

Mar1411 08:12 PM
yaa09d

4 
1,965 
Let X be a single observation from the density f\left(x;\theta\right) = \theta x^{\theta 1}I_{(0,1)} (x), where...

Mar1411 07:35 AM
statdad

1 
1,069 
Hi,
I am interested in the product of a Gaussian random variable with itself. If X is Gaussian then what is X^2? We...

Mar1411 06:19 AM
architect

3 
2,642 
I have five groupings of data measurements, each group with a different quantity of measurements. I want to see if...

Mar1211 08:35 PM
statdad

2 
9,112 
So if I start with a multivariate distribution f(x,y), I can find the marginal distributions, the conditional...

Mar1211 02:02 PM
shaiguy6

4 
3,024 
Hi,
This problem has been bugging me for while. I hope someone can explain it.
1) If I measure something with a...

Mar1211 11:44 AM
SW VandeCarr

1 
809 
I'm trying to prove the following:
if E is infinite set and F is finite set. prove that E and E U F have the same...

Mar1011 09:41 AM
AKG

12 
3,517 
Hello,
let's consider the set \Omega of all the continuous and integrable functions f:R \to R.
Suppose we now take...

Mar1011 09:21 AM
AKG

9 
1,527 
Prove the following theorem about the limit of the composition of functions.
Theorem 1 Let f : A → R and g : B → A....

Mar1011 09:04 AM
mathwonk

1 
1,501 
I fitted a nixedeffects model to a dataset from a longitudinal study in R. This is the R code I used:
data <...

Mar1011 04:41 AM
artbio

0 
864 
\exists x \phi(x) \implies \exists x ( \phi(x) \land (\forall y \in x) \lnot \phi(y)), where \; y \; is \; not \; free...

Mar911 11:12 PM
AKG

7 
1,263 
Hello,
I was wondering if anyone knew how to find a moment generating function about the mean. What I want is a...

Mar911 07:27 PM
shaiguy6

2 
1,436 
Are all true statements provable? Is there an axiom or theorem that says one way or the other?

Mar911 11:33 AM
AKG

13 
2,693 
How would I evaluate the following:
P(A(B or C)) where B and C are two mutually exclusive events.
I have scoured...

Mar911 07:56 AM
statdad

2 
757 
Would just like a hand with this question
If X and Y are independent standard Gaussian random variables (that is,...

Mar911 07:34 AM
statdad

1 
2,334 
X is a random variable with a continuous distribution with density f(x)=e^(2x), x e R
How would you calculate...

Mar811 08:27 PM
chiro

3 
1,646 
I was asked this question about a week ago and I can't figure it out. I get confused in the numbers. This is not a...

Mar811 05:00 PM
gatorpowerpt

0 
510 
I want to calculate E of the following continuous distribution having density: f(x)=e^2x
for x in the reals (x e...

Mar811 03:23 AM
tinytim

6 
1,389 
Question:
Given that any open subset E of the set of real numbers is a disjoint union of open intervals.
Is E a...

Mar611 06:00 AM
disregardthat

1 
805 
I've been tutoring students at my college this semester, and came across this problem with a student:
Show for all...

Mar611 02:54 AM
JThompson

3 
2,172 
There are three prisoners A,B and C,one of them will be randomly picked by the king to be freed,two others will be...

Mar511 05:03 PM
kmwest

1 
1,125 
I have some questions about the presentation of the P vs NP problem here. I'm quite new to this stuff, so pardon my...

Mar511 07:50 AM
Robert1986

3 
3,552 
Suppose you had a normal deck of 52 playing
cards and lost a card. You then decide to draw
a card from the...

Mar511 07:43 AM
hholzer

2 
1,627 
I want to distrubute questionaires to five groups of people with different educational back grounds;
• Group 1; No...

Mar411 02:38 PM
alex_boothby

0 
878 
The number of cars driving past a parking area in a oneminute time interval has a Poisson distribution with mean...

Mar311 06:27 PM
bpet

1 
1,846 