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

Feb2313 09:25 AM
micromass

1 
32,523 
I have a psychological testing instrument that produces an ordinal measure (0, 1, 2, 3, 4, 5). I want to change this...

Jun2514 06:49 AM
Simon Bridge

7 
2,315 
In all the literature that I have seen it is mentioned that these two are "branches" of integral geometry, but no...

Jun2014 07:04 PM
ftr

3 
2,392 
Hey,
So I am trying to do a triquadratic curve fit (linear regression) in excel. I have successfully completed a...

Jun2014 02:57 PM
mathman

1 
2,349 
Putting the following three statements together:
(a) Assuming that the continuum hypothesis is false, the power of...

Jun2014 01:06 PM
nomadreid

2 
2,183 
Hello,
Found a book on proofs and went to the exercise section. The proofs are fairly easy. The problem is the...

Jun1714 12:35 AM
pwsnafu

11 
2,896 
These two coins are strange because the probability between their heads and tails can be adjusted from 0% to 100%....

Jun1614 07:33 PM
StrangeCoin

50 
10,562 
Every archer hits the target every time and they shoot at it for ten seconds with the speed of 1 arrow per 3 seconds...

Jun1614 02:57 PM
Hornbein

4 
2,102 
for the class 100199, the f (number of household) is 20, but in the histogram, the frequency is divided by 2 which...

Jun1614 07:59 AM
DrClaude

5 
2,094 
my question is on part ii, my range ( as shown in the photo), is between 4.52 and 16.28, so my working would be...

Jun1514 10:12 PM
Simon Bridge

3 
1,844 
I have what I think is probably a basic question from probability and statistics (about which I'm pretty ignorant).
...

Jun1314 09:13 PM
FactChecker

8 
2,046 
I've been reading Oksendal, and it's quite tedious. It want to see if my understanding of the motivation and process...

Jun1314 05:12 PM
Matterwave

1 
1,645 
SDE
##d_t=\frac{1}{2}\sigma(X_t)\sigma'(X_t)d_t+\sigma(X_t)dW_t##
##X_0=x_0##
i) Let...

Jun1214 10:52 AM
adjacent

1 
1,544 
As I understand it, one result of the central limit theorem is that the sampling distribution of means drawn from any...

Jun1114 12:08 PM
micromass

7 
1,689 
Hey PF!
I had a quick question for you about skewness and kurtosis. Suppose that I am measuring velocity in one...

Jun1014 04:51 PM
Hornbein

3 
1,379 
hello again pf!
as a really simple question, can someone talk to me about the difference between variance and...

Jun1014 03:19 PM
joshmccraney

2 
1,138 
I'm not sure if I am using the right terms here, but:
When X is a finite set and R is a relation....
If (X,R) is...

Jun1014 12:13 PM
XodoX

4 
997 
hey pf!
i am wondering, if you're looking at two data sets and each set has different skewness levels (i.e. perhaps...

Jun914 05:40 PM
FactChecker

1 
1,022 
Let A(i) be the event that the first ith person have different birthdays for i=1,2,3...,n.
We note that A(i+1) is a...

Jun614 03:38 PM
mathman

1 
918 
Hi guys, I'm working through a problem right now and would like to pick your brains on some stuff.
I have an...

Jun614 06:42 AM
FactChecker

5 
819 
please refer to the second line of solution, since we only concerned about the probability of getting number (5) ,...

Jun514 01:42 PM
Erland

1 
654 
I know that, for a random vector (X,Y,Z) jointly normally distributed, the conditional expectation E is an additive...

Jun514 10:39 AM
estebanox

2 
568 
The well ordering theorem states that every nonempty set has a least element for some ordering (<). This means that...

Jun414 04:26 PM
Martin Rattigan

4 
647 
My professor stated the following:
"Dividing in pieces is called 'quantiles'. In almost all cases quartiles are...

Jun414 08:24 AM
alan2

7 
325 
I'm going through the Degroot book on probability and statistics for the Nth time and I always have trouble 'getting...

Jun314 03:44 PM
homeomorphic

2 
363 
I know that we can easily construct a set whose cardinality is strictly greater than that of the set of real numbers...

Jun214 02:08 PM
mathman

3 
318 
Hi, I'm asking this in relation to samples of DNA amplicons, but I'm so confused by probability, that I think it would...

Jun214 07:39 AM
micromass

3 
303 
If we accept that there does indeed exist a set whose cardinality is between \aleph_0 and \aleph_1, what would such a...

Jun114 09:12 PM
gopher_p

3 
284 
After running into the dilemma of having nothing to do a little while ago, I decided to try working on a Project Euler...

May3114 11:07 PM
Nick O

2 
293 
for part iv, where does the 4c1 and 5c1 come from? the question need 3 marbles , but there's only 2 marbles are chosen...

May3114 09:58 AM
Simon Bridge

6 
390 
Hi! I'm taking my first course in statistics and am hoping to get some intuition for this set of problems...
...

May3114 05:44 AM
FactChecker

3 
288 
for second group, why the set of numbers of ( 132, 152, 153, 154, 213, 214 , 215, 216, 231, .......) is not included?...

May3014 08:06 PM
Simon Bridge

7 
341 
Hi!
Suppose we have two variables Y and Z that depend on a third one, X. We are given P(x), P(yx) and P(zx). The...

May3014 07:28 PM
carllacan

4 
209 
Something that I haven’t given much thought to, until recently, is probability. This book I have been reading goes...

May2914 12:28 AM
switz5678

12 
670 
I have a byte array of length 16384 bytes obtained from random.org/bytes.
There is a random number sequence test...

May2614 11:00 PM
FactChecker

5 
344 
Hello I know this sounds stupid but my friend told me about something that made me think. So what he told me was that...

May2614 05:04 PM
Curly_810

3 
458 
Guys... I'm not a mathematician, so, sorry about my informality in math...
here is something crazy that I...

May2614 02:41 PM
maajdl

11 
615 
Hi. I notice that some values of X on the exponential distribution PDF have a value of around 1. I understand the...

May2614 07:13 AM
oneamp

6 
230 
What is the significance of the standard deviation (equal to the mean) in an exponential distribution? For example,...

May2614 07:13 AM
oneamp

6 
263 
I know that if you have 4 numbers eg. 1,23,4 then the total number fo diffferent combination is
4*3*2*1 = 24
what...

May2514 04:57 AM
paulfr

5 
342 
Can I get the link to the prime number theorem?

May2414 11:06 PM
micromass

1 
257 