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

Feb2313 09:25 AM
micromass

1 
31,655 
Greetings,
I'm not sure if this site, or this area of the site, is the most likely place for me to get an answer to...

Apr2714 03:50 PM
mathman

1 
271 
You are selling apples from a stand at the market.
You are making a profit to comfortably cover your costs and...

Apr2514 12:10 PM
wigglywoogly

6 
472 
Our task is to determine if P(c \le X \le c) has a minimum variance unbiased estimator for a sample from a...

Apr2514 11:56 AM
Stephen Tashi

3 
287 
Hi there. I would like to ask you one question about variance of estimator.
Suppose that Y_i=βX_i+ε_i and β...

Apr2514 08:18 AM
trenekas

2 
260 
I've been wondering about a simple question that I can't just google and get the answer to. Usually when we calculate...

Apr2414 03:41 PM
Hornbein

3 
352 
Hello guys, I posted this question in the classical mechanics forum (thinking stochastic mechanics falls into the...

Apr2414 01:05 PM
Matterwave

9 
439 
I've been trying to think of the grammatically correct way to translate A\cupB and A\capB.
So, let's say A is the...

Apr2214 07:55 PM
Mark44

15 
602 
This is from a text on mathematical logic. The theorem to be proven (specialization):
If Δ \vdash \forallvP, then Δ...

Apr2214 07:25 PM
gopher_p

3 
295 
Are set operations on a set ##X## defined as operations on ##2^X##? In other words a binary operation on ##X## is an...

Apr2214 06:56 PM
V0ODO0CH1LD

4 
318 
Hello,
When doing a weighted least squares fit of a model to data, I want to examine the residuals to see if...

Apr2114 08:18 AM
MarneMath

2 
341 
Hallo,
I'm trying to compare the distance between two distributions that I got from a Kernel smoothing density...

Apr2014 10:46 AM
Stephen Tashi

1 
261 
I have roughly 80 test results from different samples, each result set is a list of concentrations of various chemical...

Apr1714 11:22 AM
Stephen Tashi

3 
376 
Hello,
it is claimed that the so called GTest can be used as a replacement for the wellknown Chisquared test....

Apr1614 01:05 AM
mnb96

2 
321 
The scores X1 and X2 in papers 1 and 2 of an examination are normally distributed with means 24.3 and 31.2...

Apr1514 11:11 PM
Unusualskill

8 
314 
Hello everyone,
I am an aspiring math teacher taking a workshop type class and in two weeks my group will be...

Apr1514 10:13 PM
FactChecker

2 
391 
maybe this is too basic question but it is not so clear for me. when we refer to a random experiment, can a...

Apr1514 09:39 PM
chogg

23 
981 
Definition of maximal, greatest, minimal and least elements of a set: http://i.stack.imgur.com/PnI9V.png
...

Apr1514 01:01 PM
micromass

1 
289 
Hello,
it is wellknown that the Chisquare test between an observed distribution O and an expected distribution E...

Apr1514 10:35 AM
mnb96

2 
315 
Is the law of total probability a theorem or an axiom?

Apr1414 01:32 PM
TSC

3 
297 
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 
395 
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 
423 
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 
933 
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 
357 
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 
348 
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 
283 
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 
375 
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 
331 
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 
278 
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 
365 
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 
494 
Basically, The OrnsteinUhlenbeck (OU) process (and its timeintegral) decribes the velocity of a brownian particle....

Apr814 05:05 PM
mpresic

5 
530 
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 
346 
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 
289 
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 
241 
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 
245 
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 
285 
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 
354 
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 
289 
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 
279 
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 
299 