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

Feb2313 09:25 AM
micromass

1 
27,583 
I have roughly 80 test results from different samples, each result set is a list of concentrations of various chemical...

T 06:57 PM
geetar_king

0 
103 
I've been wondering about a simple question that I can't just google and get the answer to. Usually when we calculate...

T 04:36 PM
micromass

1 
65 
Hello,
it is claimed that the so called GTest can be used as a replacement for the wellknown Chisquared test....

T 01:05 AM
mnb96

2 
117 
The scores X1 and X2 in papers 1 and 2 of an examination are normally distributed with means 24.3 and 31.2...

Y 11:11 PM
Unusualskill

8 
104 
Hello everyone,
I am an aspiring math teacher taking a workshop type class and in two weeks my group will be...

Y 10:13 PM
FactChecker

2 
153 
maybe this is too basic question but it is not so clear for me. when we refer to a random experiment, can a...

Y 09:39 PM
chogg

23 
463 
Definition of maximal, greatest, minimal and least elements of a set: http://i.stack.imgur.com/PnI9V.png
...

Y 01:01 PM
micromass

1 
86 
Hello,
it is wellknown that the Chisquare test between an observed distribution O and an expected distribution E...

Y 10:35 AM
mnb96

2 
106 
Is the law of total probability a theorem or an axiom?

Apr1414 01:32 PM
TSC

3 
130 
Hello,
I have a 16x16 contingency table, and I would like to perform a test in order to reject the hypothesis of...

Apr1414 07:05 AM
mnb96

6 
184 
Let (A,\mathcal A), (B,\mathcal B) be measurable spaces. Let p be a probability measure on (A,\mathcal A), and let...

Apr1314 12:07 PM
economicsnerd

0 
120 
Hi all. I'm having trouble understanding the cartesian product of a (possible infinite) family of sets.
Lets say...

Apr1214 12:24 PM
Stephen Tashi

5 
204 
You are selling apples from a stand at the market.
You are making a profit to comfortably cover your costs and...

Apr1214 11:40 AM
Stephen Tashi

4 
150 
I’m working on ways to try and assess if data selection methods are capable of isolating accurate results (from a...

Apr1114 02:26 AM
geo101

22 
593 
I've been learning Ito calculus and it seems so underdeveloped. What's new? What are the open problems? Who's working...

Apr1114 02:12 AM
Simon Bridge

3 
155 
I am selfstudying an oldish text on introductory logic by Copi. The text lists some criteria by which arguments by...

Apr1014 04:41 PM
Stephen Tashi

3 
124 
There had been a case in the UK where a woman's two babies died one after the other. Then some apparent statistician...

Apr1014 04:10 PM
Stephen Tashi

3 
137 
I have several data points with error bars, and these error bars are different sizes for each of the data points. I'd...

Apr1014 04:08 PM
chogg

10 
205 
I'm reading about countable and uncountable sets, I found the following statement: "The set of the functions from...

Apr1014 03:41 PM
trash

7 
155 
Suppose we have a function ##F:\mathbb{R}_+\to\mathbb{R}_+## such that ##\frac{F(y)}{y}## is decreasing.
Let ##x##...

Apr1014 01:48 PM
jbunniii

3 
135 
Relevant Information
A language is a set of strings over an alphabet
A string is a finite set of characters from an...

Apr1014 03:21 AM
Stephen Tashi

5 
192 
Hi guys,
I have run multiple simulations on networks that are all slightly perturbed from each other. They produce...

Apr914 11:45 AM
Stephen Tashi

11 
288 
Basically, The OrnsteinUhlenbeck (OU) process (and its timeintegral) decribes the velocity of a brownian particle....

Apr814 05:05 PM
mpresic

5 
285 
So I am working with a Hidden Markov Model with continuous observation, and something has been bothering me that I am...

Apr814 09:33 AM
rynlee

2 
164 
A card game involves dealing 3 types of cards to players. There are 6 type A cards, 9 type B cards and 6 type C cards....

Apr814 09:24 AM
bpet

1 
161 
Hi all. I need to prove or disprove if process Y_n=1/2*X_n+1/4*X_{n1}+1/8*X_{n2} are stricly stationary. X_n,n\in R...

Apr714 04:14 PM
mathman

1 
123 
The well ordering theorem states that every nonempty set has a least element for some ordering (<). This means that...

Apr714 10:21 AM
HallsofIvy

1 
150 
Hello All,
I'm building a HMM for some data where there are two different time delays. Specifically, I collect data...

Apr514 05:32 PM
rynlee

2 
128 
I'm having a little trouble with the proof that the expected value of x_i is \bar{X}
What I have is
...

Apr514 03:04 PM
mathman

3 
151 
Whyis it easier to disprove something than to prove something?
Why can you have more certainty of something being...

Apr514 10:41 AM
Atomised

4 
219 
I was reading an article in the Wall street journal and the author was using a rolling correlation coefficient, on a...

Apr314 06:22 PM
FactChecker

2 
173 
Hello.
I was wondering if the following is correct.
Let S= a*X/(b*X+c), where a,b,c are positive constants and X...

Apr314 03:45 PM
mathman

1 
156 
I have faced the following problem recently:
We have a sequence A of M consecutive integers, beginning at A = 1:...

Apr214 03:12 PM
NateTG

1 
205 
Hi all!
I have a problem on finding the first passage time for kinetic monte carlo model.
Suppose I have a linear...

Apr214 06:11 AM
bpet

6 
235 
The average if the binomial distribution with probability k for succes is simply:
<> = Nk
So this means that if...

Apr114 06:40 PM
mathman

3 
252 
This interesting problem was posted on another math forum (http://www.sosmath.com/CBB/viewtopic.php?f=6&t=62620):
...

Mar3114 05:10 PM
willem2

10 
315 
Hello, i was wondering if the following is correct:
The expected value of (a*x+b*x*y)/(c*y) given that a,b,c are...

Mar3114 03:47 PM
mathman

1 
180 
Here is the problem I have faced recently that I cannot deal with yet and I need some help:
Given is the
 list of...

Mar3114 01:09 AM
grigor

4 
253 
I am trying to derive the distribution for the sum of two random vectors, such that:
\begin{align}
X &= L_1 \cos...

Mar2914 12:40 PM
Stephen Tashi

5 
289 
Hello everybody. This is my first post here and I hope I'm not asking a question that's been addressed already (I did...

Mar2914 07:38 AM
FactChecker

6 
263 